Sound not working all greyed out

Hi, recently the sound stopped working on the family Imac. when using volume toggles the speaker icon is all greyed out and there is a kindof cancel icom below the volume level bar. also there are no devices listed in the sound output tab. tried reloading mountain lion, to no avail and ive read some discusions on the apple forums. also check the headphone jack and there is NO red light.

One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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cedricganon wrote:
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Message Edited by boon2 on 05--2009 09:44 PMMessage Edited by boon2 on 05--2009 09:5 [email protected]

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Admin Notes: I understand that you are frustrated but cursing & swearing is not allowed here. If you need help from customer support, you can contact them through email. Please abide to the rules if you want to participate in this forum.
Message Edited by KokChoy-CL on <span class='local-date'> 02-7-2009<span class='local-time'> 09:50 [email protected]

Sound not working all greyed out

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