Lock single user mode? sum

Is it possible to lock single user mode? Like when unauthorized persons get their hands on your mac and boots into sum, it will ask for a root password or something before they can do anything? Thanks a lot!
os x 10.9.4 - macbook airs and pros

Thanks you, quick question, is there a difference between a "root password" and a "firmware password"?
Kappy
Frank Caggiano

Similar Messages

Single-user mode: How to mount and access an external USB drive?

My MacBook Pro HD is acting up. Cannot boot normally or into "safe mode". Cannot reinstall OS without wiping out the HD. Need to recover some critical files but DiskUtil First Aid and Restore options cannot successfully complete. Problem traced down to "invalid node structure" which means I either have a hardware problem or my filesystem partition directory structure is corrupted. I need to recover some files that are not backed up (timin issue with my regular backup process).
I can boot into single-user mode, mount the root file system (/sbin/mount -uw /) and can see/navigate the rot filesystem structure via good UNIX command line. Here's what I would like to do (in single-user mode):
1. Mount an external USB drive (250 GB already formatted as Mac OS X Extended)
2. Copy various files and/or directories from my HD to the external USB drive (UNIX cp command)
I realize I could go spend $$ for the Disk Warrior or Data Rescue products (or something similar) that SHOULD help me recover my HD or files, but it seems silly to do this when I can see, touch and taste them from within single-user mode....
Comments? Suggestions?
TIA --
Trent
P.S. Once I've recovered my files, I'll try to reformat the HD and then reinstall the OS. And THEN go have Apple look at my machine (thank goodness for AppleCare coverage)!

Resolution:
1) Boot system in single-user mode (SUM) with external HD attached.
2) Execute the following UNIX CLI commands once SUM boot process is completed:
# fsck -fy
# mount -uw /
# mkdir /Volumes/target_directory
# mount -t hfs -w /dev/diskXXX /Volumes/target_directory
# cp -RXv /source_directory /Volumes/target_directory
Where XXX is the device-level name for your external HD's data partition. In my case this was /dev/disk1s2. It may take some experimentation to identify this device name if your system has multiple HD's.
3) Verify contents were successfully copied onto the /Volumes/target_directory.
Comments and observations:
- Do NOT use "/" as your source directory - cp will make a second (redundant) copy of /volumes/target_directory
- I was able to successfully copy ALL files off my HD despite the fsck command's "invalid node structure" error message with this simple procedure. YMMV, depending on the state of your HD.
- The repeated disk0s2: I/O error warnings displayed during the SUM boot process did not seem to have a negative effect on this procedure. I also received this same error warning intermittently as I navigated the mounted filesystem did not seem to be a problem, either. Again, YMMV.
Commercial software:
I downloaded ProSoft Engineering's Data Rescue 3 product (trial version) before spending $99 to attempt to recover my "bad" HD's data via mounting to a good system with FW target mode. It could not successfully complete its "QuickScan" process and immediately hung on block 0 of 390M during its "Deep Scan" process. The product did seem to function properly on an operational system. ProSoft's technical support was responsive and helpful but had no answer for my "Deep Scan" error.
I did not attempt to use Alsoft's Disk Warrior 4 product. I could not find any trial software available and was reluctant to spend $100 based upon the mixed reviews and comments on this discussion forum as well as other reviews. Alsoft does claim to address the "invalid node structure" error in their marketing materials. Hindsight being 20/20 - I saved $100 by using this simple procedure.
Final note:
Neither Leopard nor Snow Leopard's installation DVD could recognize the bad internal HD when trying to do a reinstall. While DiskUtil was able to "see" the bad internal drive it immediately failed when I tried to do an "erase and format". Took the system to my local Apple store and the Genius ran a tool called "SMART Utility" from Volitans Software (www.volitans-software.com). SMART utility confirmed that my HD was bad so it was replaced. AppleCare pays for itself (once again!).

Can't log in with valid password, can't boot from disk, can't access disk utility, in single user mode can't reset password as appears locked in caps mode with '?' for forward slash, can anyone help?

Can't log in with valid password, can't boot from disk, can't access disk utility, in single user mode can't reset password as appears locked in caps mode with '?' for forward slash, can anyone help?

Which keyboard layout you were using? German, French ... I suppose your layout is reset to the default: US and you are unable to find the "?" or "/" ...
Please have a look into the keyboard viewer, to see how the layout of your keyboard is actually.
marek

Single user mode locks up hard

Is anyone else having this type of problem? I had it with both Panther and now also with Tiger. I've filed a bug on this with apple, but they closed it citing the usual "you have third party ram" argument. The ram has zero issues with anything else and I've done some very extensive testing of it (running remember for 72+ hours without a single fault).
Basically what happens is within 2 seconds of getting the root shell prompt in single user mode it locks up. By lock up I mean that the keyboard is locked out and no method of input works. Funny enough if there was a key pressed down when this happens the key keeps repeating, even if I unplug the keyboard.
This machine seems to be kind of haunted (have other problems with it as well, all registered with Apple) but I can't get them to replace it.
Just looking to see if I'm the only one with this problem or not ....
TIA

Are you using a Bluetooth keyboard? Some people have reported being unable to type in Single User mode with a Bluetooth keyboard, even though everything else works normally.
(8916)

IMac 7,1 boot only in single user mode

Hi all
I've a colleague with the following problem... his iMac 20'' (iMac7,1) is able to boot ONLY in safe/single user mode (with shift key pressed during boot).
If he tries to boot normally, after the usual Apple logo screen he gets a blank (light grey) screen. No finder, no login screen.
We've tried this procedures:
- SMB reset
- PRAM cleared
- OS Reinstall (we've tried from Lion to Mavericks... actually there's 10.7.5 installed)... note that ALL installation procedure has completed successfully.
- tested the 1 RAM module installed (seems to be OK)
- tested the HD (no problems found)
Despite all these attempts, this iMac is booting well only if we press SHIFT during startup. All programs run well, wifi is working and online update too. If we reboot leaving it to restart normally (no key pressed) it shows Apple Logo for 1 minutes, then (after a black reset of the screen) seems to crash/stuck into an empty grey screen.
Is possible to identify which driver/kext is causing this problem? It can be an hardware problem? How we can fix it?
Thank you!

1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem. But with the aid of the test results, the solution may take a few minutes, instead of hours or days.
Don't be put off by the complexity of these instructions. The process is much less complicated than the description. You do harder tasks with the computer all the time.
2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. Backup is always a must, and when you're having any kind of trouble with the computer, you may be at higher than usual risk of losing data, whether you follow these instructions or not.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
3. Below are instructions to run a UNIX shell script, a type of program. As I wrote above, it changes nothing. It doesn't send or receive any data on the network. All it does is to generate a human-readable report on the state of the computer. That report goes nowhere unless you choose to share it. If you prefer, you can act on it yourself without disclosing the contents to me or anyone else.
You should be wondering whether you can believe me, and whether it's safe to run a program at the behest of a stranger. In general, no, it's not safe and I don't encourage it.
In this case, however, there are a couple of ways for you to decide whether the program is safe without having to trust me. First, you can read it. Unlike an application that you download and click to run, it's transparent, so anyone with the necessary skill can verify what it does.
You may not be able to understand the script yourself. But variations of the script have been posted on this website thousands of times over a period of years. The site is hosted by Apple, which does not allow it to be used to distribute harmful software. Any one of the millions of registered users could have read the script and raised the alarm if it was harmful. Then I would not be here now and you would not be reading this message.
Nevertheless, if you can't satisfy yourself that these instructions are safe, don't follow them. Ask for other options.
4. Here's a summary of what you need to do, if you choose to proceed:
☞ Copy a line of text in this window to the Clipboard.
☞ Paste into the window of another application.
☞ Wait for the test to run. It usually takes a few minutes.
☞ Paste the results, which will have been copied automatically, back into a reply on this page.
The sequence is: copy, paste, wait, paste again. You don't need to copy a second time. Details follow.
5. You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode, under the conditions in which the problem is reproduced. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
6. If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can't log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this section doesn’t apply. Don't log in as root.
7. The script is a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, though you may not see all of it in the browser window, and you can then copy it. If you try to select the line by dragging across the part you can see, you won't get all of it.
Triple-click anywhere in the line of text below on this page to select it:
PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/libexec;clear;cd;p=(Software Hardware Memory Diagnostics Power FireWire Thunderbolt USB Fonts SerialATA 4 1000 25 5120 KiB/s 1024 85 \\b%% 20480 1 MB/s 25000 ports ' com.clark.\* \*dropbox \*genieo\* \*GoogleDr\* \*k.AutoCAD\* \*k.Maya\* vidinst\* ' DYLD_INSERT_LIBRARIES\ DYLD_LIBRARY_PATH -86 "` route -n get default|awk '/e:/{print $2}' `" 25 N\\/A down up 102400 25600 recvfrom sendto CFBundleIdentifier 25 25 25 1000 MB ' com.adobe.AAM.Updater-1.0 com.adobe.CS4ServiceManager com.adobe.CS5ServiceManager com.adobe.fpsaud com.adobe.SwitchBoard com.apple.AirPortBaseStationAgent com.apple.installer.osmessagetracing com.apple.SafariNotificationAgent com.apple.usbmuxd com.apple.xprotectupdater com.google.keystone.agent com.google.keystone.daemon com.microsoft.office.licensing.helper com.oracle.java.Helper-Tool com.oracle.java.JavaUpdateHelper ' ' 879294308 3627668074 1083382502 1274181950 1855907737 464843899 1233118628 2636415542 842973933 4019080058 3301885676 891055588 998894468 695903914 1443423563 ' 51 5120 files );N5=${#p[@]};p[N5]=` networksetup -listnetworkserviceorder|awk ' NR>1 { sub(/^$[0-9]+$ /,"");n=$0;getline;} $NF=="'${p[26]}')" { sub(/.$/,"",$NF);print n;exit;} ' `;f=('\n%s: %s\n' '\n%s\n\n%s\n' '\nRAM details\n%s\n' %s\ %s '%s\n-\t%s\n' );S0() { echo ' { q=$NF+0;$NF="";u=$(NF-1);$(NF-1)="";gsub(/^ +| +$/,"");if(q>='${p[$1]}') printf("%s (UID %s) is using %s '${p[$2]}'",$0,u,q);} ';};s=(' s/[0-9A-Za-z._]+@[0-9A-Za-z.]+\.[0-9A-Za-z]{2,4}/EMAIL/g;/faceb/s/(at\.)[^.]+/\1NAME/g;/\/Shared/!s/(\/Users\/)[^ /]+/\1USER/g;s/[-0-9A-Fa-f]{22,}/UUID/g;' ' s/^ +//;/de: S|[nst]:/p;' ' {sub(/^ +/,"")};/er:/;/y:/&&$2<'${p[10]} ' 1s/://;3,6d;/[my].+:/d;s/^ {4}//;H;${ g;s/\n$//;/s: [^EO]|x([^08]|02[^F]|8[^0])/p;} ' ' 5h;6{ H;g;/P/!p;} ' ' ($1~/^Cy/&&$3>'${p[11]}')||($1~/^Cond/&&$2!~/^N/) ' ' /:$/{ N;/:.+:/d;s/ *://;b0'$'\n'' };/^ *(V.+ [0N]|Man).+ /{ s/ 0x.... //;s/[()]//g;s/(.+: )(.+)/ (\2)/;H;};$b0'$'\n'' d;:0'$'\n'' x;s/\n\n//;/Apple[ ,]|Genesy|Intel|SMSC/d;s/\n.*//;/\)$/p;' ' s/^.*C/C/;H;${ g;/No th|pms/!p;} ' '/= [^GO]/p' '{$1=""};1' ' /Of/!{ s/^.+is |\.//g;p;} ' ' $0&&!/ / { n++;print;} END { split("'"${p[41]}"'",b);for(i in b) print b[i];if(n<10) print "com.apple.";} ' ' $3~/[0-9]:[0-9]{2}$/ { gsub(/:[0-9:a-f]{14}/,"");} { print|"tail -n'${p[12]}'";} ' ' NR==2&&$4<='${p[13]}' { print $4;} ' ' END { $2/=256;if($2>='${p[15]}') print int($2) } ' ' NR!=13{next};{sub(/[+-]$/,"",$NF)};'"`S0 21 22`" 'NR!=2{next}'"`S0 37 17`" ' NR!=5||$8!~/[RW]/{next};{ $(NF-1)=$1;$NF=int($NF/10000000);for(i=1;i<=3;i++){$i="";$(NF-1-i)="";};};'"`S0 19 20`" 's:^:/:p' '/\.kext\/(Contents\/)?Info\.plist$/p' 's/^.{52}(.+) <.+/\1/p' ' /Launch[AD].+\.plist$/ { n++;print;} END { split("'"${p[41]}"'",b);for(i in b) print b[i]".plist";if(n<200) print "/System/";} ' '/\.xpc\/(Contents\/)?Info\.plist$/p' ' NR>1&&!/0x|\.[0-9]+$|com\.apple\.launchctl\.(Aqua|Background|System)$/ { print $3;} ' ' /\.(framew|lproj)|\):/d;/plist:|:.+(Mach|scrip)/s/:[^:]+//p ' '/^root$/p' ' !/\/Contents\/.+\/Contents|Applic|Autom|Frameworks/&&/Lib.+\/Info.plist$/ { n++;print;} END { if(n<1100) print "/System/";} ' '/^\/usr\/lib\/.+dylib$/p' ' /Temp|emac/{next};/(etc|Preferences|Launch[AD].+)\// { sub(".(/private)?","");n++;print;} END { split("'"${p[41]}"'",b);split("'"${p[42]}"'",c);for(i in b) print b[i]".plist\t"c[i];if(n<500) print "Launch";} ' ' /\/(Contents\/.+\/Contents|Frameworks)\/|\.wdgt\/.+\.([bw]|plu)/d;p;' 's/\/(Contents\/)?Info.plist$//;p' ' { gsub("^| |\n","\\|\\|kMDItem'${p[35]}'=");sub("^...."," ") };1 ' p '{print $3"\t"$1}' 's/\'$'\t''.+//p' 's/1/On/p' '/Prox.+: [^0]/p' '$2>'${p[43]}'{$2=$2-1;print}' ' BEGIN { i="'${p[26]}'";M1='${p[16]}';M2='${p[18]}';M3='${p[31]}';M4='${p[32]}';} !/^A/{next};/%/ { getline;if($5<M1) a="user "$2"%, system "$4"%";} /disk0/&&$4>M2 { b=$3" ops/s, "$4" blocks/s";} $2==i { if(c) { d=$3+$4+$5+$6;next;};if($4>M3||$6>M4) c=int($4/1024)" in, "int($6/1024)" out";} END { if(a) print "CPU: "a;if(b) print "I/O: "b;if(c) print "Net: "c" (KiB/s)";if(d) print "Net errors: "d" packets/s";} ' ' /r\[0\] /&&$NF!~/^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./ { print $NF;exit;} ' ' !/^T/ { printf "(static)";exit;} ' '/apsd|BKAg|OpenD/!s/:.+//p' ' (/k:/&&$3!~/(255\.){3}0/ )||(/v6:/&&$2!~/A/ ) ' ' $1~"lR"&&$2<='${p[25]}';$1~"li"&&$3!~"wpa2";' ' BEGIN { FS=":";p="uniq -c|sed -E '"'s/ +\$[0-9]+\$\$.+\$/\\\2 x\\\1/;s/x1$//'"'";} { n=split($3,a,".");sub(/_2[01].+/,"",$3);print $2" "$3" "a[n]$1|p;b=b$1;} END { close(p);if(b) print("\n\t* Code injection");} ' ' NR!=4{next} {$NF/=10240} '"`S0 27 14`" ' END { if($3~/[0-9]/)print$3;} ' ' BEGIN { L='${p[36]}';} !/^[[:space:]]*(#.*)?$/ { l++;if(l<=L) f=f"\n "$0;} END { F=FILENAME;if(!F) exit;if(!f) f="\n [N/A]";"cksum "F|getline C;split(C, A);C="checksum "A[1];"file -b "F|getline T;if(T!~/^(AS.+ (En.+ )?text(, with v.+)?$|(Bo|PO).+ sh.+ text ex|XM)/) F=F" ("T", "C")";else F=F" ("C")";printf("\nContents of %s\n%s\n",F,f);if(l>L) printf("\n ...and %s more line(s)\n",l-L);} ' ' s/^ ?n...://p;s/^ ?p...:/-'$'\t''/p;' 's/0/Off/p' ' END{print NR} ' ' /id: N|te: Y/{i++} END{print i} ' ' / / { print "'"${p[28]}"'";exit;};1;' '/ en/!s/\.//p' ' NR!=13{next};{sub(/[+-M]$/,"",$NF)};'"`S0 39 40`" ' $10~/\(L/&&$9!~"localhost" { sub(/.+:/,"",$9);print $1": "$9;} ' '/^ +r/s/.+"(.+)".+/\1/p' 's/(.+\.wdgt)\/(Contents\/)?Info\.plist$/\1/p' 's/^.+\/(.+)\.wdgt$/\1/p' ' /l: /{ /DVD/d;s/.+: //;b0'$'\n'' };/s: /{ /V/d;s/^ */- /;H;};$b0'$'\n'' d;:0'$'\n'' x;/APPLE [^:]+$/d;p;' ' /^find: /d;p;' "`S0 44 45`" ' BEGIN{FS="= "} /Path/{print $2} ' ' /^ *$/d;s/^ */ /;' ' /:/d;/\./p;' '/\.appex\/Contents\/Info\.plist$/p' );c1=(system_profiler pmset\ -g nvram fdesetup find syslog df vm_stat sar ps sudo\ crontab sudo\ iotop top pkgutil 'PlistBuddy 2>&1 -c "Print' whoami cksum kextstat launchctl sudo\ launchctl crontab 'sudo defaults read' stat lsbom mdfind ' for i in ${p[24]};do ${c1[18]} ${c2[27]} $i;done;' defaults\ read scutil sudo\ dtrace sudo\ profiles sed\ -En awk /S*/*/P*/*/*/C*/*/airport networksetup mdutil sudo\ lsof test osascript\ -e );c2=(com.apple.loginwindow\ LoginHook '" /L*/P*/loginw*' "'tell app \"System Events\" to get properties of login items'|tr , \\\n" 'L*/Ca*/com.ap*.Saf*/E*/* -d 1 -name In*t -exec '"${c1[14]}"' :CFBundleDisplayName" {} \;|sort|uniq' '~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $' '.??* -path .Trash -prune -o -type d -name *.app -print -prune' :${p[35]}\" :Label\" '{/,}L*/{Con,Pref}* -type f ! -size 0 -name *.plist -exec plutil -s {} \;' "-f'%N: %l' Desktop L*/Keyc*" therm sysload boot-args status " -F '\$Time \$Message' -k Sender kernel -k Message Req 'bad |Beac|caug|corru|dead[^bl]|FAIL|fail|GPU |hfs: Ru|inval|jnl:|last value [1-9]|n Cause: -|NVDA$|pagin|proc: t|Roamed|rror|ssert|Thrott|tim(ed? ?|ing )o|WARN' -k Message Rne 'Goog|ksadm|SMC:|suhel| VALI|ver-r|xpma' -o -k Sender fseventsd -k Message Req 'SL' " '-du -n DEV -n EDEV 1 10' 'acrx -o comm,ruid,%cpu' '-t1 10 1' '-f -pfc /var/db/r*/com.apple.*.{BS,Bas,Es,J,OSXU,Rem,up}*.bom' '{/,}L*/Lo*/Diag* -type f -regex .\*[cght] ! -name .?\* ! -name \*ag \( -exec grep -lq "^Thread c" {} \; -exec printf \* \; -o -true $ -execdir stat -f:%Sc:%N -t%F {} \;|sort -t: -k2 |tail -n'${p[38]} '/S*/*/Ca*/*xpc* >&- ||echo No' '-L /{S*/,}L*/StartupItems -type f -exec file {} +' '-L /S*/L*/{C*/Sec*A,Ex}* {/,}L*/{A*d,Ca*/*/Ex,Co{mpon,reM},Ex,In{p,ter},iTu*/*P,Keyb,Mail/B,Pr*P,Qu*T,Scripti,Sec,Servi,Spo,Widg}* -path \\*s/Resources -prune -o -type f -name Info.plist' '/usr/lib -type f -name *.dylib' `awk "${s[31]}"<<<${p[23]}` "/e*/{auto,{cron,fs}tab,hosts,{[lp],sy}*.conf,mach_i*/*,pam.d/*,ssh{,d}_config,*.local} {,/usr/local}/etc/periodic/*/* /L*/P*{,/*}/com.a*.{Bo,sec*.ap}*t {/S*/,/,}L*/Lau*/*t .launchd.conf" list getenv /Library/Preferences/com.apple.alf\ globalstate --proxy '-n get default' -I --dns -getdnsservers\ "${p[N5]}" -getinfo\ "${p[N5]}" -P -m\ / '' -n1 '-R -l1 -n1 -o prt -stats command,uid,prt' '--regexp --only-files --files com.apple.pkg.*|sort|uniq' -kl -l -s\ / '-R -l1 -n1 -o mem -stats command,uid,mem' '+c0 -i4TCP:0-1023' com.apple.dashboard\ layer-gadgets '-d /L*/Mana*/$USER&&echo On' '-app Safari WebKitDNSPrefetchingEnabled' "+c0 -l|awk '{print(\$1,\$3)}'|sort|uniq -c|sort -n|tail -1|awk '{print(\$2,\$3,\$1)}'" 'L*/P*/com.ap*.p*.ext*.*.*t -exec '"${c1[14]}"' :displayOrder" {} \;' );N1=${#c2[@]};for j in {0..9};do c2[N1+j]=SP${p[j]}DataType;done;N2=${#c2[@]};for j in 0 1;do c2[N2+j]="-n ' syscall::'${p[33+j]}':return { @out[execname,uid]=sum(arg0) } tick-10sec { trunc(@out,1);exit(0);} '";done;l=(Restricted\ files Hidden\ apps 'Elapsed time (s)' POST Battery Safari\ extensions Bad\ plists 'High file counts' User Heat System\ load boot\ args FileVault Diagnostic\ reports Log 'Free space (MiB)' 'Swap (MiB)' Activity 'CPU per process' Login\ hook 'I/O per process' Mach\ ports kexts Daemons Agents XPC\ cache Startup\ items Admin\ access Root\ access Bundles dylibs Apps Font\ issues Inserted\ dylibs Firewall Proxies DNS TCP/IP Wi-Fi Profiles Root\ crontab User\ crontab 'Global login items' 'User login items' Spotlight Memory Listeners Widgets Parental\ Controls Prefetching SATA Descriptors appexes );N3=${#l[@]};for i in 0 1 2;do l[N3+i]=${p[5+i]};done;N4=${#l[@]};for j in 0 1;do l[N4+j]="Current ${p[29+j]}stream data";done;A0() { id -G|grep -qw 80;v[1]=$?;((v[1]==0))&&sudo true;v[2]=$?;v[3]=`date +%s`;clear >&-;date '+Start time: %T %D%n';};for i in 0 1;do eval ' A'$((1+i))'() { v=` eval "${c1[$1]} ${c2[$2]}"|'${c1[30+i]}' "${s[$3]}" `;[[ "$v" ]];};A'$((3+i))'() { v=` while read i;do [[ "$i" ]]&&eval "${c1[$1]} ${c2[$2]}" \"$i\"|'${c1[30+i]}' "${s[$3]}";done<<<"${v[$4]}" `;[[ "$v" ]];};A'$((5+i))'() { v=` while read i;do '${c1[30+i]}' "${s[$1]}" "$i";done<<<"${v[$2]}" `;[[ "$v" ]];};';done;A7(){ v=$((`date +%s`-v[3]));};B2(){ v[$1]="$v";};for i in 0 1;do eval ' B'$i'() { v=;((v['$((i+1))']==0))||{ v=No;false;};};B'$((3+i))'() { v[$2]=`'${c1[30+i]}' "${s[$3]}"<<<"${v[$1]}"`;} ';done;B5(){ v[$1]="${v[$1]}"$'\n'"${v[$2]}";};B6() { v=` paste -d: <(printf "${v[$1]}") <(printf "${v[$2]}")|awk -F: ' {printf("'"${f[$3]}"'",$1,$2)} ' `;};B7(){ v=`grep -Fv "${v[$1]}"<<<"$v"`;};C0() { [[ "$v" ]]&&sed -E "$s"<<<"$v";};C1() { [[ "$v" ]]&&printf "${f[$1]}" "${l[$2]}" "$v"|sed -E "$s";};C2() { v=`echo $v`;[[ "$v" != 0 ]]&&C1 0 $1;};C3() { v=`sed -E "${s[63]}"<<<"$v"`&&C1 1 $1;};for i in 1 2;do for j in 0 2 3;do eval D$i$j'(){ A'$i' $1 $2 $3; C'$j' $4;};';done;done;{ A0;D20 0 $((N1+1)) 2;D10 0 $N1 1;B0;C2 27;B0&&! B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D23 0 $((N1+4)) 5 4;D13 0 $((N1+9)) 59 50;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D22 35 49 61 51;D22 11 17 17 20;for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;};D22 12 44 54 45;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 32 0;B4 0 5 11;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 32 6;B4 0 7 11;B3 4 0 22;A3 14 6 32 0;B4 0 8 11;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 52 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;B3 4 0 65;A3 14 6 32 0;B4 0 16 11;A1 4 50 64;B7 16;C3 52;D13 24 24 32 31;D13 25 37 32 33;A2 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&{ D13 21 0 32 19;D13 10 42 32 40;D22 29 35 46 39;};D23 14 1 62 42;D12 34 43 53 44;D12 22 20 32 25;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;B1&&D23 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 20 42 32 41;D13 37 2 48 43;D13 4 5 32 1;D13 4 3 60 5;D12 26 48 49 49;B3 4 22 57;A1 26 46 56;B7 22;B3 0 0 58;C3 47;D22 4 4 50 0;D23 22 9 37 7;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
8. Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Click anywhere in the Terminal window and paste by pressing command-V. The text you pasted should vanish immediately. If it doesn't, press the return key.
9. If you see an error message in the Terminal window such as "Syntax error" or "Event not found," enter
exec bash
and press return. Then paste the script again.
10. If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. In most cases, the difference is not important. If you don't know the password, or if you prefer not to enter it, press the key combination control-C or just press return three times at the password prompt. Again, the script will still run.
If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.
11. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, there will be nothing in the Terminal window and no indication of progress. Wait for the line
[Process completed]
to appear. If you don't see it within half an hour or so, the test probably won't complete in a reasonable time. In that case, close the Terminal window and report what happened. No harm will be done.
12. When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
At the top of the results, there will be a line that begins with the words "Start time." If you don't see that, but instead see a mass of gibberish, you didn't wait for the "Process completed" message to appear in the Terminal window. Please wait for it and try again.
If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
13. When you post the results, you might see an error message on the web page: "You have included content in your post that is not permitted," or "You are not authorized to post." That's a bug in the forum software. Please post the test results on Pastebin, then post a link here to the page you created.
14. This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
Copyright © 2014 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

Why can't I enter single user mode on my Mac Mini for an admin password reset?

Hi,
I recently created a new user account for my mac and deleted the old one, not realising that this was the only account with admin priveleges. As such, I no longer have access to administrator priveleges, and cannot grant them to my new user account.
I have tried to boot in single user mode and recovery mode but neither command results in any reaction on the part of my computer.
This thread follows on from a previous, unrelated disscussion:
BDAqua: If you hold alt key at bootup do you see a lock in the middle?
Yenots: No...what does this mean?
BDAqua: If it did, it would mean Firmware Password Protection was enabled, which prevents booting in other modes, so that's not the problem, are you using a wired Mac KB, or Windows KB?
Yenots: I'm using an 'Apple Keyboard with Numeric Keypad' [ http://store.apple.com/uk/product/MB110B/B/apple-keyboard-with-numeric-keypad-br itish ]
If you find me here BDAqua, hit me with your knowledge!
Any other contributions are welcome and, now we're under the right heading, will hopefully help other users who have encountered this problem.
Thanks, Cristo

Hi,
Thanks for the link to MacPilot, and the sexy screenshot. I found an archived version for 10.4 on the koingosw website. That solves getting into single user/safe mode. Though I'd be interested to see whether sudo nvram boot-args="-s" will result in single user boot.
As for creating administrator priveleges for my new user account, I've found a method which looks good:
     \single user mode\
     cmd-s
     \mount drive\
     mount -uw
     \open 'directory access'\
     lauchctl load /System/Library/LaunchDaemons/com.apple.opendirectory.plist
     \list users\
     ls /Users
     \change password\
     dscl . passwd /Users/<username> <password>
I think that this method intends that if I change the root users password I'll be changing the administrator password (as root is the only user with administrator priveleges), and subsequently be able to change my new user accounts priveleges using 'netinfomanager'. But I'm not 100%. Could you give me your opinion on this?
Furthermore, three keys 'L' 'O' and '(' aren't working on my keyboard, which means I can't try this until I find an intact keyboard to borrow. I was thinking maybe a mod version of the above instructions would work in terminal using sudo, so I could use the keyboard viewer to type the missing characters. If you have any ideas on constructing such a mod I would be interested to hear them.
Otherwise, Thank You for your help BDAqua! And enjoy your summer wherever you are.

Wipe a HD via Unix in Single User Mode?

Is it possible to wipe a hard drive using diskutil or another method when booting up in Single User Mode? We routinely need to wipe drives and if possible, this would be the easiest.
I suspect because the OS that boots in Single User Mode is on that same drive will make this impossible.
Thanks in advance for your tips and comments,
Doug

Yes, you cannot erase an OS while it's 'hosting' the erasure. Single user mode is part of Mac OS X, so it's on the hard drive, not in the firmware or anything super-low-level like that. Oh well. So... you might be able to erase the vast majority of user, application, and even OS files, but it won't be complete and won't be 'as good as' a volume-format.
A couple alternatives come to mind (sorry if you know all this. Not trying to be pedantic or patronizing, just making sure you know your options).
We keep host computers around just for running wipes, backups, and diagnostics that cannot run from a drive holding the booted OS. You simply restart the to-be-wiped Mac holding the 't' key, connect it via firewire, and treat it as an external hard drive.
You could also just boot from a Mac OS X install disc and wipe from the copy of Disk Utility included on the disc. Better yet, throw a +bona fide+ copy of OS X onto a pocket hard drive, boot the victim-Mac from that (hold option while it is first starting up), and wipe the internal HD normally, now that it's not in use. You could maybe even use single user mode in the booting OS, like you'd imagined, and format from there (I'm not sure that would be faster than letting it boot normally, though, as you might have to use "dd" or some other similar low-level wipe method, as I don't think the frameworks required for Apple's cli "diskutil" are available in single user mode).
I haven't tried to use it on a Mac, but I have a 256 MB USB flash drive with, er, ['Darn' Small Linux|http://tinyurl.com/5md7t] on it for diagnosing Windows boxes. It runs a script on boot which, if you don't intervene to run utilities or what-have-you, will wipe all attached hard drives and shut down. I keep it locked up for understandable reasons, but its super useful just as a time-saver, booting most machines and beginning the countdown-to-wipe in under ten seconds.
Anyway, let us know what your goals and thoughts are.
Cheers, Joel

Single user mode, Lost Admin Account, and Disk Permissions

Okay, so I have quite a few issues here. I will start from the beginning.
About a week ago, I tried to install some updates and I could not get the Admin account to work. I went to the users profile and noticed my Admin account was not there. Did a quick search and found Apple's outline of how to fix this via the Operational DVD and the root user. Tried this and it would never work, because as soon as I restarted the computer or changed screens it switched back to a standard account.
Next up, I went into the terminal to check the Admin User group. As it turns out it is not there. So I find a discussion on there that outlines how to rebuild this in single user mode and the Unix prompt. So, I print it off and try to restart in single user mode. After trying two different keyboards and a sum total of 8 to 10 times, I can't restart in single user mode to get to the Unix prompt.
One last thing, last night I went into the Disk Utility on the start-up DVD. I wanted to check the Repair Permission log and I got the following:
ACL found but not expected on "private/var/root/Library/Preferences"
ACL found but not expected on "private/var/root/Library/"
ACL found but not expected on "Network"
Thoughts?
Thanks for your help!
tpp

first, the ACL messages can be ignored. if you can't get to single user mode you can't fix your admin group. the only reasons that I know why you wouldn't be able to do that is
1. a defective keyboard
2. you have a firmware password set. have you? you'd have to turn it off before you can get to single user mode.
lastly when you restart in single user mode make sure you press command+s right after you hear the chime. do not press it too early or too late. lastly, I'm not sure which instructions you've found to fix the admin group but I have them in this thread
http://discussions.apple.com/thread.jspa?messageID=8011324

IMac G5 won't boot in normal and safe mode, but will from single-user mode

Hello everyone,
I'm quite new here, so I try to do my best if you have a question.
Yesterday, someone nearby me had a iMac G5 (Powermac8,1), and he sayd, that the computer sometimes will boot, sometimes not.
I did test it, I thought it was running fine, but when I played some music in iTunes, it was stuck on 9 seconds, and crashed (with a kernel panic). The guy also sayd, that there was nothing important on the computer, so a clean install was fine.
Now, the problem is, that it will not boot in normal mode (without anything pressed on boot), also it won't in safe mode (shift-boot), but it will, when I enter single-user mode, mount the hard drive and exit from single-user mode so it will go futher on booting. Sometimes it will not, and immediately gives you a kernel panic in single-user mode, but it will 90 percent of the time.
Then you've got another problem: when it's running in the normal desktop from single-user mode, it'll be stuck after some time again. If I look into the Kernel Panic file created, most times it's because of Spotlight indexing, so I disabled that.
He also gave me the disks (Apple Hardware Test and Extra Applications, and iMac G5 Mac OS X Install Disks 1-3) that came with the Mac. He sayd that I could use them, but I think he didn't test out the SuperDrive, because when I insert a disk, it will try to read, but it will make 2 same sounds, and quits after 10 tries, when it will spit the cd out. Also normal (audio) disks.
Also, I must hurry with the commands for mounting and exiting in single-user mode, or it will just not boot.
In all cases, after 30-45 seconds from pressing the power button, the fan will start blowing at full speed, and it will stop after the exit command in Single-user mode. That's weird.
I can't do anything with the SuperDrive, I can't normally boot in Mac OS X except for Single-user mode (but I don't think he would like to do that every time the computer boots up), and I have very limited time when Mac OS X arrived on the desktop.
When booting in Verbose mode, it will be stuck on this:
AppleSMU::PMU vers = 0x000d004c, SPU vers = 0x15, SDB vers = 0x01,
(and sometimes ends with a kernel crash by fsck_hfs)
Things I've tried (without any success):
- /sbin/fsck -fy (in single-user mode)
- Disabling Spotlight and mds
If you want some more information, feel free to ask!
Greetings
-MrYoranimo
PS: My main language is Dutch, so my English can be bad at some points.

Thank you for your support! This reply is a little bit late, because I was to the camping this weekend.
The only thing I sure do know, is that the iMac has a bad SuperDrive. That's one problem, but I don't really wanna use it, and you fix everything by Single-user mode and when I get to the desktop to test things and change stuff in the Preference Panes.
What also came to my mind was that there also is a problem with the videocard (driver), because sometimes when I boot into Single-user mode, I can see some white pixels which aren't supposed to be there. And when booting from SUM you can see that some of the colors are different and there are weird patterns on the screen.
I also tried to setup a NetBoot server on this computer (MacBook Mid 2010) with just Lion 10.7.4 on it, but I'm not that expert and I didn't really find the good posts on the Internet, although I tried it with the Server applications and both Server applications and DeployStudio. But I didn't succeed.
I don't really like buying a new FireWire hard disk or external FireWire dvd reader/writer, except if it has USB support, because my MacBook doesn't support FireWire, and I really wanna make use of it then.
If I know more or have fixed it, I will surely post again here with what I did to fix it (if no one else has posted here already ).

Errors while Changing the Database to Mutli User Mode from Single user mode in SQL Server 2012

Hi,
Good Afternoon :). Need your help in resolving one of the issue with SQL Server 2012.
Today, we kept one of the database in the Single User mode and wanted to bring back to Multi User mode. But we are getting the below error. There are no user sessions connected to this database which are blocking each other. I see multiple
SYSTEM sessions are in blocked state.  The blocking is not cleared even affter restarting the SQL services.
Verified the SQL Server Errorlog and couldnt get much useful information to troubleshoot the issue.
pasted the information from the sys.sysprocesses as well for your kind reference.
Msg 1205, Level 13, State 68, Line 1
Transaction (Process ID 55) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
Msg 5069, Level 16, State 1, Line 1
ALTER DATABASE statement failed.
spid
kpid
blocked
waittype
waittime
dbid
login_time
status
cmd
18
1004
36
0x0005
144
5
4/9/2014 13:13
background
TASK MANAGER
35
1796
36
0x0005
35
5
4/9/2014 13:34
background
TASK MANAGER
36
2464
37
0x0005
363
5
4/9/2014 13:34
background
TASK MANAGER
37
5100
36
0x0005
254
5
4/9/2014 13:04
background
TASK MANAGER

Clearly 36 and 37 are causing deadlock.
see
https://www.simple-talk.com/sql/database-administration/handling-deadlocks-in-sql-server/
http://www.mssqltips.com/sqlservertip/1036/finding-and-troubleshooting-sql-server-deadlocks/
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

Macbook shuts off during start-up - can't get through safe-mode, single user mode (fsck -fy) and target-drive shows no problems when running disk utility repair

Hi everyone,
I'm simply all out of ideas on what to do - my best guess is the problem is not specifically hard-drive related since all the 'normal' fixes just won't work.
What could be the cause of my issue? The only way i've managed to keep the Macbook Pro on for longer than a minute is through target drive, where it seems to work just fine - i can access everything. To sum up everything:
1 - I tried resetting the PRAM
2 - I tried to go in to safe mode, it shut off before i could type the password
3 - I tried fsck -fy command from single user mode, sometimes i can get to actually typing it but mostly it shuts off before
4 - I tried to repair disk via target drive - success, no problems detected (and it didnt fix my issue)
5 - I reinstalled OS Mavericks.
The Macbook Pro previously had some problems with the power-button not working properly (a mac-cunning friend of mine had to open up the mac and start it by swiping to metal pins on a specific (battery/power?) part inside it. The problem kinda went away afterwards but it might be related to this?
This is way off my comfort zone of 'diagnosing' issues, so I'm crossing fingers for some good advice.
Thanks,
Aske
Denmark

I think you're right.
If it's hardware related, is it possible to guess at what it might be? It would be nice to know how much I should expect to pay for a repair before actually getting it fixed.

Won't boot normally or in recovery and single user mode, safe mode hangs up halfway

iMac locked up with visual glitches while playing the Mac beta client of League of Legends. Had to force a shutdown by holding the power button. Now it won't boot; after the Apple logo and spinning wheel I just get a white screen. I tried launching in recovery mode, that didn't work. Then I tried safe mode; the bar filled a little over half and then nothing but white screen. I was able to boot single user mode once; ran fsck -fy and rebooted, still white screen. Now I can't get back to single user mode. I booted with command option P R to reset the NVRAM and got the second chime, but still nothing.
Luckily all my important files are in the cloud, but I'm really hoping my computer isn't completely dead. I haven't had any issues in the past. I've even been playing LoL for over a month with no issues, until now when I tried to play the newer game types, Dominion and ARAM; both caused visual glitches forcing shutdowns. I was able to restart my computer with no problem after the first two visual glitches, but after the last one I am stuck at the white screen as I described above.
Thanks in advance for your help!

I'd bet the drive is damaged. You could try reformatting if possible. Again, you are booting from the Recovery-10.8.2 disk if you can. If you can't, then you will need to use the installer disc that came with the computer.
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

Can't enter Single-User Mode

I just bought tiger for my 12 inch powerbook G4. am unable to complete installation due to an error with my 10.2. The problem is I dont have the start up disks anymore and can't enter single-use or verbose-mode to fix the problem.
Any ideas on how to upgrade or enter single-use?
Thanks
Ben

An Open Firmware password is one thing that would prevent you from changing the startup disk, booting from a CD or starting up in single user mode. You would see a lock and a dialog asking you to enter your password. So, it doesn't seem that this is your problem.
If you have some file directory damage, you can use the Tiger install DVD to attempt to repair it. Put the DVD in the drive, restart and hold down on the "c" key (if you have one and then choose the language you want to use. At the next screen, do not continue to install but choose to open the Disk Utility from the Utilities menu. You can then use the Disk Utility to "repair disk" on your hard drive. The Tiger Disk Utility is pretty mature and can repair many problems.
-Doug

I'm having kernal panics even in single user mode

My new Mac Pro has been having kernal panics left and right. I've done everything suggested here plus everything the Apple people have been telling me to do both on the phone and at the local Apple store. Nothing helps and the last call I made the Apple tech suggested I install a new hard drive which he is sending me. I also have his extension number so I can call him when the install is done. In the meantime while I'm waiting for the new hard drive I manage to reinstall the system after a couple of tries and just for grins boot into single user mode and let the computer sit for awhile. When I get back I find the computer has once again crashed and this one line stands out "simple lock deadlock detection". What this means I have no clue but I'm beginning to suspect what I have is a real lemon. If anyone has some insight they'ld like to share on this I'm open to suggestions.
P.S. And just to let you know I've done the following:
1. I've booted into safe boot mode and it crashes
2. I've booted off the install DVD and let it stand and it crashes
3. I've disconected everything but the mouse and keyboard and it crashes
4. I've reinstalled the system numerous times and it still crashes
5. I've taken it to the local Apple store where they replaced the memory and it still crashes
6. I've called the Apple help line and followed their suggestions which included unplugging the computer for 15 seconds to clear the SMU and it crashes even worse.
7. I've zapped the pram and reset the nvram and it still crashes
8. Even when I left it at the local Apple Store where they used their monitor, mouse, keyboard, and power cord it still crashes
9. It crashes on startup from time to time
10. And last but not least it crashes in single user mode even though I've done fsck -fy and then let it just sit
11. Oh yes and one more thing, the crashes are completely random and unpredictable.
Mac Pro duel core intel xeon 2.66mhz Mac OS X (10.4.9)

Well I finally resolved my issue, hopefully. Upon installing the new hard drive I had no problems for a week or so and decided to add a second drive and put my old system on it and see what would happen when I booted from the second drive. All went well for a week and then boom the crashes began again. I then switched back to the new drive with the fresh system and all went well for a little over a week when boom the panics returned. I called Apple and they made an appointment for me at the local Apple store. After looking at my files which included about 7 phone calls and several visits to the Apple store the best solution was a brand new Mac Pro. All this has been covered under warranty which is awesome. The only crashing I've had to date had to do with something called "mdimportserver" whatever that is. I also can only use one ethernet connector which is strange. I figured it might have to do with the new hard drive so I booted over to the old drive and everything is working fine except for the ethernet port which I haven't tried yet. I figure for now it's best to let that sleeping dog alone since everything else is working so good. When I'm sure this new Mac is working ok I'll wipe the new drive and use Super Duper to clone this system over rather than use Apple's migration assistant which evidently didn't do such a good job of migrating my system over. I'll let you all know how it goes several weeks from now hopefully.

Bluetooth problems in single user mode

I've already checked some of the discussions on this topic but did not find the answers that i am looking for. i need to get into single user mode because my computer will not completely boot the osx. however, after i hold down the command-s and the promt comes up, it is af if i have no keyboard at all. i cannot type anything. is this due to the fact that i have a bluetooth keyboard? would going out and purchasing a usb help me out (because i have read some posts that they have the same problem with a usb)? is there any way around this. single user is becoming one of my last alternatives to having to reformat. please help!
best

A wireless bluetooth keyboard would only let you boot into Single User Mode, after that, you will need a regular USB keyboard to type in the prompts, same goes when doing a Hardware Test using the disc provided.
As for some users posted on this forum saying they have not able to continue the Single User Mode under a regular USB keyboard, I am afraid I am one of them... I have not been able to solve the problem as yet and it is kinda "annoying" that there "may be something wrong" with my iMac that I cannot perform fsck, nevertheless I have regularly booted from the OS disc and run Disk Utility, which is equivilent to booting to SUM, but supposingly much better, and my HD checks out fine... so at the moment I have no worries.
In my post there is another person who has regularly keeping me update about this problem and has deduced it maybe due to the internal bluetooth module and the USB inside... rather complex issue that may require me lengthy conversation with AppleCare or have something replace, or "worse" have my iMac sent away for a time for repair or replacement. Since my iMac is doing quite fine, I'll live with it for the moment...
Cheers

Lock single user mode? sum

Similar Messages

Maybe you are looking for