My computer won't boot up even in safe mode

I have a 2010 Imac that has been a great computer. Yesterday, I tried to turn it back on and it wouldn't boot up. The white screen with the apple came on, the little wheel spun and then it went directly to a dark gray screen that I could see the mouse present.
I looked on line the directions to start it up in safe mode, but that didnt work either.
Help. I hope it is fixable.

hi i would recomend going into the the intel imac section this section is for older imacs you would be able to get an answer to your question faster. just copy and past what you said and select imac intel instead

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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.
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(and sometimes ends with a kernel crash by fsck_hfs)
Things I've tried (without any success):
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- 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 ).

Mac won't boot properly unless in safe mode

Recently I updated my MacBook Pro to OS X Yosemite. I then started the process of the data encryption.
I don't know what happened, but maybe the encryption failed, because now every time I turn my mac on, it won't boot properly unless it's in safe mode.
Either it will have a black screen with a visible cursor, or just the desktop with no dock or the bar along the top and no icons, or it does boot up properly, but works extremely slowly. Like if I was to press the apple symbol on the top-right of the screen, it would take 5 minutes to actually open it. Nothing works properly.
And so I opened up my system preferences, and discovered that the Encryption is stuck on half-finished. But I can't stop it. If I try to turn encryption off it says I have to wait till it's finished. But it never does, the progress bar never moves.
If I open System Preferences while in Safe Mode, the progress bar for Encryption is grey, and underneath it says "connect to power to continue encryption". But it IS connected to power.
Have I stuffed my Mac? Is there a way to get it working again?

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:
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\\*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*/$USER&&echo On' '-app Safari WebKitDNSPrefetchingEnabled' "+c0 -l|awk '{print(\$1,\$3)}'|sort|uniq -c|sort -n|tail -1|awk '{print(\$2,\$3,\$1)}'" -m 'L*/{Con*/*/Data/L*/,}Pref* -type f -size 0c -name *.plist.???????|wc -l' kern.memorystatus_vm_pressure_level '3>&1 >&- 2>&3' " -F '\$Time \$Message' -k Sender kernel -k Message CSeq 'n Cause: -' " );N1=${#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::'${p[33+j]}':return { @out[execname,uid]=sum(arg0) } tick-10sec { trunc(@out,1);exit(0);} '";done;l=(Restricted\ files Hidden\ apps 'Elapsed time (s)' POST Battery Safari\ extensions Bad\ plists 'High file counts' User Heat System\ load boot\ args FileVault Diagnostic\ reports Log 'Free space (MiB)' 'Swap (MiB)' Activity 'CPU per process' Login\ hook 'I/O per process' Mach\ ports kexts Daemons Agents XPC\ cache Startup\ items Admin\ access Root\ access Bundles dylibs Apps Font\ issues Inserted\ dylibs Firewall Proxies DNS TCP/IP Wi-Fi Profiles Root\ crontab User\ crontab 'Global login items' 'User login items' Spotlight Memory Listeners Widgets Parental\ Controls Prefetching SATA Descriptors App\ extensions Lockfiles Memory\ pressure SMC Shutdowns );N3=${#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" ]];};A'$((7+i))'() { v=` eval sudo "${c1[$1]} ${c2[$2]}"|'${c1[30+i]}' "${s[$3]}" `;[[ "$v" ]];};';done;A9(){ 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 $1;};for i in 1 2 7 8;do for j in 0 2 3;do eval D$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;B1&&D73 19 53 67 55;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 54 12 56;D23 5 14 12 14;D22 6 36 13 15;D22 20 52 66 54;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D82 35 49 61 51;D82 11 17 17 20;for i in 0 1;do D82 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&&{ A8 18 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 26 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&&{ D73 21 0 32 19;D73 10 42 32 40;D82 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 21 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&&D83 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 10 42 32 41;D13 37 2 48 43;D13 4 5 32 1;D13 4 3 60 5;D12 21 48 49 49;B3 4 22 57;A1 21 46 56;B7 22;B3 0 0 58;C3 47;D22 4 4 50 0;D12 4 51 32 53;D23 22 9 37 7;A9;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.

Won't boot anymore but in safe mode

My laptop won't boot anymore. I get a gray screen with a prohibition sign. Here's what I found so far:
If I boot in the verbose mode it gets stuck on something like Looking for boot device.
I zapped the PRAM. Didn't help.
I can boot in safe mode.
I used Disk Utility to check the drive and permisions. Everything ok.
I can't boot from the original Snow Leopard DVD. I press C, the drive spins then stops.
I reinstalled Snow Leopard from the safe mode. Didn't help.
In safe mode Safari is crazy slow. Firefox runs full speed.
Any idea?

Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.
Unless you can boot from your installer DVD there's nothing you can do to reinstall OS X, so I'm not sure how you did reinstall as you said.
Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo appears.
5. Wait for installer to finish loading.

My Macbook Pro won't boot up, only in safe mode!

Help, my macbook pro won't restart, only in safe mode! and it seems that safe mode has plenty of implications for use. my usb memory stick doesn't seem to be recognized while in safe mode. I was doing a cleanup on mackeeper just after I downloaded a trial version of microsoft office mac. The trial wouldn't work properly so I deleted it and decided to do a cleanup with mackeeper. than the mac froze while mackeeper was doing it's cleanup and the screen flashed black a few times. Ever since it won't boot up unless I use safe mode. Also, I downloaded the most recent updates while in safe mode but it doesn't seem to be recognizing that I already downloaded them because software update is still telling me that I have 6 updates. So I am horribly confused at this point. Please help, I need this laptop to do report cards (it's a good thing I got an extension). thanks

Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
These steps are to be taken while booted in safe mode.
Below are instructions to enter some UNIX shell commands. The commands are harmless, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects.
The commands may line-wrap or scroll in your browser, but each one is really just a single line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then either copy or drag it. The headings “Step 1” and so on are not part of the commands.
Launch the 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.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Step 1
Triple-click the line of text below to select it. Copy the selected text to the Clipboard (command-C). Then click anywhere in the Terminal window and paste (command-V).
find /Sy*/L*/Ex* -type f -name Info.plist -exec sh -c '/usr/libexec/PlistBuddy -c "Print :CFBundleIdentifier" "$1" 2> /dev/null | egrep -qv "apple|Accusys|ArcMSR|ATTO|CalDigit|HighPoint|hp-fax|JMicron|print|SoftRAID|stex" && echo ${1%*.kext/*}.kext' {} {} \;
Post the lines of output (if any) that appear below what you just entered (the text, please, not a screenshot.) You can omit the final line ending in “$”.
Step 2
Repeat with this line:
ls -1A /e*/mach* {,/}L*/{Ad,Compon,Ex,Fram,In,Keyb,La,Mail/Bu,P*P,Priv,Qu,Scripti,Servi,Spo,Sta}* L*/Fonts 2> /dev/null
Important: If you formerly synchronized with a MobileMe account, your me.com email address may appear in the output of the above command. If so, anonymize it before posting.
Step 3
osascript -e 'tell application "System Events" to get name of every login item' 2> /dev/null
Remember, these steps are all copy-and-paste — no typing. Also remember to post the output.
You can then quit Terminal.

Mac Pro won't boot up unless in Safe Mode

When I try to boot my Mac Pro the fans start revolving very quickly and it loads to the spinning wheel/apple logo screen. I can get it to start up in Safe Mode, and 9 times out of 10 if I restart the computer from Safe Mode I can get everything to load properly UNTIL I try to use any of the programs at which point each program freezes as I attempt to use it. Then I have to shut the computer down using the power button rather than restarting traditionally, and then I'm at square one again. This problem has gotten progressively worse, I used to be able to restart from Safe Mode and everything would work afterward.
Any thoughts?

Yes, as Hatter said, I think it's time for DiskWarrior. It is the best at directory repairs. It rebuilds then actually replaces your old directory. I feel every Mac owner should have a copy.
Make sure you get the disk, not the download, so you can boot up on it to run repairs if needed. You can also install it on another drive and run it from there to repair this one. DW works faster that way.
I use DW once a month to try and catch errors in my system from getting too far out of hand.
 DALE
p.s. Here's a rewiew of DiskWarrior 4.

Maverick not booting, not even in safe mode

Mavericks was running smooth since release.
Yesterday I started having no sound with iTunes and GarageBand.
So I restarted but booting got stuck at the first grey apple screen with the spinning wheel.
I rebooted in recovery mode and repaired disk and disk permissions. Still no luck.
Rebooting in safe mode won't work either.
I do have rEFIt installed.
Thanks for help.
Paolo

I get "Problems sere encountered during repair of The partition map" when I ask Disk Utility to "Repair Disk" at the top level of the disk hierarchy (i.e. not on one of the partitions within the disk but on the disk itself).
And: Error: Live file system repair si not supported.

Macbook won't boot, Blue Screen in Safe Mode

Having a couple of issues at the moment. To start off, woke my MacBook from sleep mode and found the screen had shimmering edges, the screen was also displaced (part of the left of the screen was showing on the right. Decided to reboot to solve the issue, when I tried this, got past the Apple logo and wheel, then got a blue screen. Now when I boot, I just get a white screen Tried booting in safe mode but ended up with a blue screen with streaks.
On top of that when I went into support, my macbook isn't listed under my products and when I tried to enter it in, it said it was under a different account (I did get it through a college course but It was definitely registered under my name and with my account).
Can anyone shed some light on this, or have any suggestions?

Actually, just get a blue screen when trying to start up normally

Old MBP won't boot, not even Target disk mode

Hi all,
My 2009 MacBook Pro was being used by a student to prepare some material for me while I worked on my new(ish) Retina MBP. The system was sluggish, despite numerous attempts to use disk repair on it, throw out unused programs, etc. It finally got so slow (we were scanning large files, and even the attempt to open Finder on a directory with the large files would cause it to freeze) that we re-installed the operating system. That didn't help, so we reformatted the disk (losing a lot of work) and started again. Things were working just fine (although it was getting slower again) and then out of the blue it would not boot.
We tried everything: Safe boot, single user, resetting *RAM, the whole kit and kaboodle.
We then set it us as a Target disk - and were happy to see some files. But happiness was only short lived. Two files could be copied before the disk refused to continue, noting errors. We turned it off and back on in Target mode - the firewire symbol appears, but it is not seen in the Finder. The disk utility can see it, but as soon as we try to verify or repair it, it disappears.
I've tried connecting it to a Windows machine - it dings, but does not appear. I've tried booting with the Install CD (won't move), I've tried booting with Linux (I get an error). Every now and then after a looooong time, it gets mounted as a Target disk. I've managed to scrape 3 (three) files from the disk, it is soon unresponsive, and then it won't mount again. Every now and they I can use the disk utility to access the disk, verify says I need to repair it, repair says I need to re-format the disk. I've done that a few weeks ago.
Any ideas for something else I can try? Thanks!

You have a hardware problem. Probably the drive has failed. But if the system does not turn on at all, no sounds of any kind, then the problem is more serious. Like the logic board has failed.
Connecting a mac hard drive to a windows system wouldn't work unless you have a program that will allow windows to read mac formatted drives. Windows can't do that itself. You need something like macdrive (I think it is called) or some other program that can read mac formatted drive on a windows pc.
But from reading your whole post the drive has completely failed. If the system still starts up, you hear the startup chime, all you have to do is replace the failed hard drive and reinstall the os and program to get the system working again.

Computer won't boot up after installing SIIG card

Hey Everyone,
I having problems with my SIIG FireWire 2-Port PCIe DV card that I've installed into my PowerMac G5 Quad. With the card installed the computer will not boot up, which is the same thing that happened with my previous two models of the card. I installed a new card yesterday and it worked fine all day, but after shutting the computer down for the night and then restarting it in the morning I am experiencing the same problems. The light on the front of the computer turns on, but the screen does not, and after about a minute a loud fan noise comes one. I have the card installed in Slot 2. In Slot 1 I have a ProTools HD card and in Slot 3 I have an AJA Kona LHE card. Even with all of the cards removed the computer still does not boot up. Anyone seen this problem before? Any help or information anybody can offer would be greatly appreciated.
PowerMac G5 Quad Mac OS X (10.4.8)

Hi, I had the same problem with my dual core G5.
I installed the card and my computer won't boot up. The screen stays gray and the fan keeps spinning.
I contacted SIIG and they said the card is defective, which, I doubt it is.
I then returned it for a refund.

Mac Pro won't boot up, not even in safe mode.

Problem: Mac Pro having severe lag issues. Added more ram, removed Kona3, etc., nothing. Tried repairing with disc warrior but unable to repair startup disc unless booted from disc warrior disc. Won't boot up from disc warrior disc so set startup disc to the disc warrior disc. Now comp won't boot up, not even from safe mode. Any suggestions?

Boot from your OS X install DVD.
You always need to have a 2nd backup you can boot from, or an emergency (only) boot drive.
Disk Warrior does not have 10.5.2+.
If you can't do anything, zap pram, see if that helps. Or pull your drives and boot from your DVD. Setup OS X on a FW drive.
And of course, always always have at least two backup sets of your system; and sets of your data - so one set at least is always off line.
http://www.geocities.com/texas_macman/pram.html
http://docs.info.apple.com/article.html?artnum=2238
http://www.apple.com/support/macpro/
http://www.thexlab.com/faqs/datacorruption.html
Issues with OS X and with Installing
http://support.apple.com/kb/TS1541
http://support.apple.com/kb/TS1388

Computer won't boot if the GTX 970 is plugged in

Hello everyone,
I just recently bought and assembled a new computer, however, the computer won't boot when the gpu is plugged in.
The motherboard I got is a MSI Z97I Gaming AC and the GPU is a MSI GeForce GTX 970.
When the GPU isn't plugged in the mobo, everything boots up fine and I was able to check with the bios that every other elements of the computer where recognized fine. When I plug in the GPU however, the system won't boot. The fans of the case, the mobo AND the GPU's are working and the GPU's leds also on, so it shouldn't be a PSU issue (I use a 750W PSU so that should cover it). However, no boot at all.
I don't really feel like trying to plug the GPU in another computer if it's just some compatibility issue or whatnot that you may be aware of. Maybe the bios doesn't recognise it ? The version is e7920IMS V1.0, I wasn't really able to find any kind of information regarding the latest versions online.
Thank you,
Yann

Here it is, follow the below to update to 1.4:
>>Use the MSI HQ Forum USB flasher<<
A.) Download the attached archive and place it on your desktop. Do not decompress.
B.) Download and install the Forum flash tool.
C.) Insert your FAT32 formatted usb stick.
D.) Make sure that all win 8 options are disabled. (Fast Boot etc) Also make sure the legacy USB is enabled.
E.) Start the forum flash tool and select option 1. Then point the tool at the compressed archive we downloaded earlier. Then to your USB Flash Drive.
F.) Boot to the USB
G.) Now follow the directions and let the tool flash
H.) After flashing reinstall ME drivers in Windows: http://download.msi.com/dvr_exe/intel_me10_mb.zip

Computer won't boot after installing MFP M127FW

My computer won't boot to my hard drive after installing my new MFP M127FW printer unless I first unplug the USB cable from the printer and then turn on the computer. My BIOS is set to boot from my hard drive, not from a USB drive, so what did the installation of the MFP M127FW drivers and software do to my computer? I assume this has something to do with the Smart Install feature.
This question was solved.
View Solution.

Hi @frcraig ,
I see that you are experiencing issues with the computer booting up when the printer is connected by the USB cable.
I would like to help you out with this issue today.
Most likely it is the Smart Install on the printer causing this. The printer looks like a disk drive.
On the printer, touch Setup, Service, Smart Install and turn it off.
If you are still having issues, in the system BIOS, disable the Boot from USB device option and the USB Legacy Support option. Doing this will allow the PC to complete the boot process to the internal hard drive and allow you to enter Windows. If this does not work for any reason, you should boot your PC before connecting the USB drive. Once the computer is fully booted into Windows, connect the USB drive and wait for the operating system to detect the drive.
Important: Do not disable the USB Legacy Support if you are using a USB Keyboard. Doing so will prevent you from being able to use the keyboard during the booting sequence.
What kind of computer do you have?
If you need further assistance, just let me know.
Have a great day!
Thank You.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Gemini02
I work on behalf of HP

My computer won't boot up even in safe mode

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