HT6065 internal speakers on my 2011 iMac don't function after 10.9.1 update

i woke my iMac up this evening, dismissed all the notifications about the software updates that happened last night (the 10.9.1 OS X update) and proceeded to open iTunes. the internal speakers work during startup (i get the boot sound) but don't work once the operating system kicks in. the headphone jack doesn't work, and i get this strange icon when i try to change the volume with the keyboard keys...
i opened up sounds in system preferences, and under "output" there are no output devices found.
i have tried the solutions i found online for no sound out of your internal iMac/macbook speakers - i have reset the SMC, the PRAM/NVRAM, have plugged/unplugged headphones from the rear headphone jack, blown into the headphone jack, jiggled a headphone plug...and nothing. i have never plugged headphones into this computer, only always used external speakers.
i am confident this is related to the software update, i literally was on itunes listening to music at my desk on Tuesday...didn't touch the computer on Wednesday, and then got on tonight to the update notifications and no sound.
below is the info about my computer...any suggestions?

i called apple support today. went through the same things with them, they recommended reinstalling OS X. so i did. and it's now fixed.
so i guess if you are experiencing this same issue, as a last resort before taking the computer into an apple store, just reinstall the operating system.
when you reboot, after the startup-sound hold (SHIFT + R) and choose reinstall OS X from the option menu that is presented.

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Launch the Terminal application in any of the following ways:
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Hi William,
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
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For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
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208.67.220.220
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IMac drops Wifi connection after 10.7.4 update

Hello there,
I am experiencing intermittent wifi connection problems after installing the 10.7.4 update on my 2011 iMac 27".
The symption is that the iMac drop its Wifi connection after a period of time and when that happens the iMac cannot detect any wifi networks in my area (disabling & re-enabling Wifi on the iMac doesn't help). I have to resort to restarting the iMac to revive the wifi interface. Note that my other devices (including my iPhone and my MacBook Air) can connect to my Airport Extreme without any problems.
Is there any "quick-fix" solutions out there that can fix this problem? I want to avoid a complete re-install as much as possible.

Possible short term fix:
Same issue. Mid 2011 iMac. Updated to 10.7.4 and wifi dropped. The iMac could see any SSID until it was rebooted. My MacBook Air, iPad and iPhone all fine.
I went to Apple tech support and like others was faced with a slippery resistance to the idea that this was anything to do with 10.7.4.
Eventually it was suggested I reinstalled Mac OS (switch off, switch on with cmd and R keys held down. Then follow the process. I wasn't hopeful but was compliant. Imagine my joy when, on coming back to me my iMac asked if I wanted to update to 10.7.4. Of course not!
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Still hoping fpr a proper fix from Apple but they don't seem to be taking seriously
in contrast just updated Omin Group's Omniplan (BTW this is great software for the Mac, check out their offering if you haven't). The update notes:
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Owning and fixing the problem - Apple guys please take note!
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My mid-2011 MacBook Air bricks itself after 10.7.2 update

I have a new MacBook Air (11") that was working just great, until today. Today, I used Software Update to install the updates, which included 10.7.2 as well as the recue partition update.
I did everything you're supposed to do, and when it rebooted, the gray screen comes up, and it shows the spinny doohickey on the bottom showing that it's working. Then, suddenly, up pops a big "no" icon (the circle with the slash through it) after about 60 seconds.
It simply doesn't do anything after that.
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Back to Software Update, back to installing 10.7.2. And .. 20 minutes later .. back to bricked MacBook Air.
What a waste of my time. What a failure, Apple. I'm very very very very very unhappy that I've wasted so much time just to update my damned iPhone to IOS 5. I'm still without an update. Now I'm trying to figure out how to move my iTunes to another machine -- not nearly as obvious as it should be. ARGH. I'm going to throw this MacBook Air off the balcony in about 10 minutes. :-(
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Wow, you're right -- I can't believe it. I just really can't believe they would screw up so badly, yet when I search for "10.7.2 filevault" I don't find more than a couple of articles about it on the web (including this thread). Why on earth wouldn't Apple have put up some kind of warning about this? I can't believe it, really. It's insane.
On my newly-functional 10.7.2 MBA, I wanted to test your theory and so I turned on filevault 2 and encrypted the main disk again. It of course wanted me to reboot. So I rebooted. And *blammy* -- same error / boot failure. Wow. Also, interestingly, even on a working 10.7.2 system, you can't mount a USB drive that was encrypted using Filevault 2 encryption (in Disk Utility, e.g., as a "Mac OS X, journalled, encrypted" volume that was encrypted with DiskUtility on Lion 10.7.1). I still have a 10.7.1 machine that I will not upgrade until I can at least decrypt the disk -- but right now, Disk Utility tells me it fails decrypting the external USB disk so I'm hosed!!! ARGH.
Now, going back to the booting problem after upgrade -- for anyone's reference who's still keeping score -- you can easily recover from the booting problem with upgrading a Filevault 2 root drive: Power-cycle the machine and then hold down cmd-r to bring up the Lion Recovery application. Within Lion Recovery, choose "Disk Utility", and then click on the (as yet unmounted, still encrypted) root hard drive to select it. Then go to the File menu, and choose "Turn off encryption" for this disk. It then prompts you for the password, and if you enter it, *blammy* you're back up and running again.
In my case, the disk had only just begun encrypting so the action was instant, and then once it confirmed the disk was now decrypted, I simply chose "Restart" from the Apple menu, and I was back in business (no hairy re-installs to deal with). If this is an already-encrypted volume, presumably it'll take you a bit longer (the normal 45-minutes to 2 hours) to decrypt it. But at least no more installing software -- it'll "just work".
Maybe I'll go post a simpler version of these instructinos on the other threads, but this is the simplest fix -- just turn off filevault 2 from within Lion Recovery, basically, and that fixes the boot problems.
Apple, if you're listening, you really really really need to say something to your users so they know. Many many many MBA users are likely to have still not upgraded. You can prevent them from hating you and your products by making sure they don't screw the pooch here. Short version: Mid-2011 MacBook Airs running Filevault 2 WILL NOT BOOT after 10.7.2 update; so users should turn off Filevault2 before upgrading.
Steve

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Start with some of the suggestions in this thread:
https://discussions.apple.com/thread/4060781?start=0&tstart=0
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I need help please.

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IMac Slow and Hanging after 10.9.1 Update

sh-3.2$ sw_vers
ProductName:          Mac OS X
ProductVersion:          10.9.1
BuildVersion:          13B42
sh-3.2$
Hardware Information:
          iMac (27-inch, Late 2012)
          iMac - model: iMac13,2
          1 2.9 GHz Intel Core i5 CPU: 4 cores
          8 GB RAM
Video Information:
          NVIDIA GeForce GTX 660M - VRAM: 512 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 7:55:39
Disk Information:
          APPLE HDD WDC WD10EALX-408EA0 disk0 : (1 TB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 999.35 GB (953.5 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
          MediaTek Inc MT1806
          Apple Inc. FaceTime HD Camera (Built-in)
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.microsoft.office.licensing.helper.plist 3rd-Party support link
          [not loaded] org.freedesktop.dbus-system.plist 3rd-Party support link
          [loaded] org.macports.bacula.plist 3rd-Party support link
Launch Agents:
          [not loaded] org.freedesktop.dbus-session.plist 3rd-Party support link
User Launch Agents:
          [loaded] com.google.keystone.agent.plist 3rd-Party support link
User Login Items:
          None
Internet Plug-ins:
          AdobePDFViewerNPAPI: Version: 11.0.06 - SDK 10.6 3rd-Party support link
          SharePointBrowserPlugin: Version: 14.3.9 - SDK 10.6 3rd-Party support link
          AdobePDFViewer: Version: 11.0.06 - SDK 10.6 3rd-Party support link
          QuickTime Plugin: Version: 7.7.3
          Default Browser: Version: 537 - SDK 10.9
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
3rd Party Preference Panes:
          FUSE for OS X (OSXFUSE) 3rd-Party support link
Bad Fonts:
          None
Old Applications:
          /Applications/Microsoft Office 2011/Office
                    Open XML for Excel:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Office Setup Assistant:          Version: 14.3.3 - SDK 10.5 3rd-Party support link
                    Microsoft Alerts Daemon:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    SyncServicesAgent:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Database Daemon:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Graph:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Database Utility:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Office Reminders:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Upload Center:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    My Day:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Chart Converter:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Clip Gallery:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
          Microsoft AutoUpdate:          Version: 2.3.6 - SDK 10.4 3rd-Party support link
                    /Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app
          /Applications/Microsoft Office 2011
                    Microsoft PowerPoint:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Excel:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Outlook:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Word:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Document Connection:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
          /Library/Application Support/Microsoft/MERP2.0
                    Microsoft Error Reporting:          Version: 2.2.9 - SDK 10.4 3rd-Party support link
                    Microsoft Ship Asserts:          Version: 1.1.4 - SDK 10.4 3rd-Party support link
          Microsoft Language Register:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    /Applications/Microsoft Office 2011/Additional Tools/Microsoft Language Register/Microsoft Language Register.app
          Solver:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Applications/Microsoft Office 2011/Office/Add-Ins/Solver.app
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
              25%          screensharingd
              23%          WindowServer
               1%          EtreCheck
               1%          Microsoft Outlook
               1%          Safari
Top Processes by Memory:
          360 MB          WindowServer
          254 MB          Microsoft Word
          156 MB          Google Chrome
          147 MB          Microsoft PowerPoint
          131 MB          com.apple.WebKit.WebContent
Virtual Memory Information:
          2.82 GB          Free RAM
          3.58 GB          Active RAM
          759 MB          Inactive RAM
          880 MB          Wired RAM
          1.37 GB          Page-ins
          0 B          Page-outs

Started this new thread from: https://discussions.apple.com/message/24577884#24577884
Attemped to run Lync Davis' one-liner script with no success:
dannys-imac:~ root# clear; shopt -s extglob; Fb='%s\n\t(%s)\n'; Fm='\n%s:\n\n%s\n'; Fs='\n%s: %s\n'; Fu='user %s%%, system %s%%'; PB="/usr/libexec/PlistBuddy -c Print"; A () { [[ a -eq 0 ]]; }; R () { o=; [[ r -eq 0 ]]; }; Pm () { [[ "$o" ]] && o=`sed 's/^ */   /' <<< "$o"` && printf "$Fm" "$1" "$o"; }; Pc () { o=`egrep -v '^[[:blank:]]*($|#)' "$2"`; Pm "$1"; }; Pp () { o=`$PB "$2" | awk -F'= ' \/$3'/{print $2}'`; Pm "$1"; }; Ps () { o="${o##+( )}"; [[ ! "$o" =~ ^0?$ ]] && printf "$Fs" "$1" "$o"; }; id | grep -qw '80(admin)'; a=$?; A && sudo true; r=$?; t=`date +%s`; clear; { A || echo $'No admin access\n'; A && ! R && echo $'No root access\n'; system_profiler SPSoftwareDataType | sed '8!d;s/^ *//'; o=`system_profiler SPDiagnosticsDataType | sed '5,6!d'`; [[ "$o" =~ Pass ]] || Pm "POST"; o=`pmset -g therm | sed 's/^.*CP/CP/'`; egrep -q 'No th|pms' <<< "$o" && o=; Pm "Thermal conditions"; o=`pmset -g sysload | grep -v :`; grep -q '= [^GO]' <<< "$o" || o=; Pm "System load advisory"; o=`nvram boot-args | awk '{$1=""; print}'`; Ps "boot-args"; d=(/ ""); D=(System User); for i in 0 1; do o=`cd ${d[$i]}L*/L*/Dia* && ls !(*.diag) | tail | awk -F_ '{$NF=a[split($NF,a,".")]; print}'`; Pm "${D[$i]} diagnostics"; done; o=`syslog -F bsd -k Sender kernel -k Message CReq 'GPU |hfs: Ru|I/O e|n Cause: -|NVDA\(|pagin|SATA W|ssert|timed? ?o' | tail -n25 | awk '/:/{$4=""; $5=""; print}'`; Pm "Kernel messages"; o=`df -m / | awk 'NR==2 {print $4}'`; o=$((o<5120?o:0)); Ps "Free space (MiB)"; o=$(($(vm_stat | awk '/eo/{sub("\\.",""); print $2}')/256)); o=$((o>=1024?o:0)); Ps "Pageouts (MiB)"; s=( `sar -u 1 10 | sed '$!d'` ); [[ s[4] -lt 85 ]] && o=`printf "$Fu" ${s[1]} ${s[3]}` || o=; Ps "Total CPU usage" && { s=(`ps acrx -o comm,ruid,%cpu | sed '2!d'`); o=${s[2]}%; Ps "CPU usage by process \"$s\" with UID ${s[1]}"; }; s=(`top -R -l1 -n1 -o prt -stats command,uid,prt | sed '$!d'`); s[2]=${s[2]%[+-]}; o=$((s[2]>=25000?s[2]:0)); Ps "Mach ports used by process \"$s\" with UID ${s[1]}"; o=`kextstat -kl | grep -v com\\.apple | cut -c53- | cut -d\< -f1`; Pm "Loaded extrinsic kernel extensions"; R && o=`sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|calendarse|cups|dove|isc|n tp|post[fg]|x)/{print $3}'`; Pm "Extrinsic system jobs"; o=`launchctl list | sed 1d | awk '!/0x|com\.apple|org\.(x|openbsd)|\.[0-9]+$/{print $3}'`; Pm "Extrinsic agents"; for d in {/,}L*/{La,Priv,Sta}*; do o=`ls -A "$d" | egrep -v '^(\.DS_Store$|com\.apple\.)'`; Pm "$d"; done; o=`find -L /S*/L*/E* {/,}L*/{A*d,Compon,Ex,In,Keyb,Mail,P*P,Qu,Scripti,Servi,Spo}* -type d -name Contents -prune | while read d; do ID=$($PB\ :CFBundleIdentifier "$d/Info.plist") || ID="No bundle ID"; egrep -qv "^com\.apple\.[^x]|Accusys|ArcMSR|ATTO|HDPro|HighPoint|driver\.stex|hp-fax|\.hp io|JMicron|microsoft\.MDI|print|SoftRAID" <<< $ID && printf "$Fb" "${d%/Contents}" "$ID"; done`; Pm "Extrinsic loadable bundles"; o=`find /u*/{,*/}lib -type f -exec sh -c 'file -b "$1" | grep -qw shared && ! codesign -v "$1"' {} {} \; -print`; Pm "Unsigned shared libraries"; o=`launchctl getenv DYLD_INSERT_LIBRARIES`; Pm "Inserted libraries"; o=`find {,/u*/lo*}/e*/periodic -type f -mtime -10d`; Pm "Modified periodic scripts"; o=`scutil --proxy | grep Prox`; Pm "Proxies"; o=`scutil --dns | awk '/r\[0\] /{if ($NF !~ /^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./) print $NF; exit}'`; Ps "DNS"; R && o=`sudo profiles -P | grep :`; Pm "Profiles"; for f in fstab sysctl.conf crontab launchd.conf; do Pc $f /etc/$f; done; Pc "hosts" <(grep -v 'host *$' /etc/hosts); Pc "User launchd" ~/.launchd; R && Pc "Root crontab" <(sudo crontab -l); Pc "User crontab" <(crontab -l); R && o=`sudo defaults read com.apple.loginwindow LoginHook`; Pm "Login hook"; Pp "Global login items" /L*/P*/loginw* Path; Pp "User login items" L*/P*/*loginit* Name; Pp "Safari extensions" L*/Saf*/*/E*.plist Bundle | sed 's/\..*$//;s/-[1-9]$//'; o=`find ~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $ | wc -l`; Ps "Restricted user files"; cd; o=`system_profiler SPFontsDataType | egrep "Valid: N|Duplicate: Y" | wc -l`; Ps "Font problems"; o=`find L*/{Con,Pref}* -type f ! -size 0 -name *.plist ! -exec sh -c 'plutil -s "$1" >&-' {} {} \; -print`; Pm "Bad plists"; d=(Desktop L*/Keyc*); n=(20 7); for i in 0 1; do o=`find "${d[$i]}" -type f -maxdepth 1 | wc -l`; o=$((o<=n[$i]?0:o)); Ps "${d[$i]##*/} files"; done; o=$((`date +%s`-t)); Ps "Elapsed time (s)"; } 2>/dev/null | pbcopy; exit 2>&-
-sh: !: event not found
dannys-imac:~ root#

IMac unable to restart after downloading latest software update (including iTunes 11.2)

My system is a mid-2007 iMac (Intel) with latest software updates always promptly installed (OSX Mavericks, etc) and 320 GB internal HD, 4GB Ram.
Today the software updater informed me that an update to iTunes was available and so I allowed it to download the update and then restart the computer. The restart was not successful - the computer display will show the status window progressing as the update is installed and then nears completion, but will freeze at the apparant point of completion and the restart will not complete. I tried restarting several times and it always hangs up and does not complete.
I then ran the Disc Utilities program - first time I ran it, it identified disc problems with the internal HD and proceeded to repair them. Following that I trried to restartt and it ran into the same difficulties and did not restart. Subsequently I ran disc utilities and it reports the internal HD to be fine. I've also tried several times to boot the computer and restore from my Time Machine backups and it will not complete the restore. I do get to the screens where I can select the volume to restore from, the volume to restore to, and so forth. After these efforts were not successful, I finally tried to re-download OSX and do a clean system restore, it progressed nearly to completion and then aborted the system installation without completing.
Since having this problem I've therefore been unable to use the computer in Mac mode. I had just about concluded that my hard disc must be replaced, when I decided to see if I could restart running Windows (bootcamp), and I was able to do that successfully. The hard disc is therefore not damaged, or at least the partition of the hard disc used by Windows is not damaged.
Is my most likely option to replace the hard disc or is there something I can still do, in order to see if the hard disc can be restored using a saved backup, before I replace it?
I have the further complication of finding that the Apple store will not replace the hard disc for my computer because it is over 5 years old. I can probably locate a shop such as Best Buy locally who can do that, or I can simply purchase an external hard disc and use that as my primary hard disc until I either replace the internal hard disc or simply replace the computer. Since it is a 7 year old iMac, it would not be surprising to have to replace the hard disc after this length of time. I also see that there are instructions available online to explain how to replace the internal hard disc myself, but I'm unsure at this point whether or not I want to do it myself.

Lacking any responses to my initial post above, I will briefly update how I resolved this issue today.
Installed new external hard disc, 1 TB WD My Passport for Mac, and straightforward setup involving first installing current OS X operating system, then system migrator utility to rebuild the same setup as saved in latest Time Machine backup. The whole process was somewhat time consuming due to my internet connection speed and USB data transfer speeds but it went without any issues. The computer now boots up and operates identical in all respects to how it did before the problem occurred.
Regarding the internal HD of my iMac, if I now run Disc Utility to verify the disc, it reports "appears to be OK". However, viewing the disc usage in "About This Mac" window, it displays as entirely empty. Opening it in the finder also shows only a "Apple Hot News.mbox" file and a single .jpeg image, and .nothing else.
Interestingly, the Bootcamp partition of my iMac's internal HD continues to work fine and appears unaffected by the problem. I use bootcamp rarely but still will plan to set up a replacement bootcamp volume on the new hard disc soon, in order to take its place.
That the problem surfaced coincident with the software update may have been nothing more than bad luck? At this point I have no reason to suspect that the softward update had anything to do with the difficulties.

HT6065 internal speakers on my 2011 iMac don't function after 10.9.1 update

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