IMac sound is gone, what shall I do???

I still have the start up sound, other than that the machine is completely quite.
The speaker sign at upper right is grey.
When I use keyboard shortcut to do volume adjustment, it shows a small disable sign at bottom like a strike through "O".
Checked system performance > Sound, found empty in output and input. seems the internal speaker is gone.
Tried to run GarageBand, shows error: "Selected Driver not Found. (-10202)".
I have tried restart a few times, but does not work.......
Help................
Help................

Hmmm, resetting the PRAM should have done it (and, if there is a "driver" file, it wouldn't be hardware).
Yes, you can install your entire system, but let's leave that as a last resort....
Try one other thing:
Go to Users -> Library -> Preferences and delete the following file:
com.apple.systempreferences.plist
Restart computer.
Try it now. Note: You may have to set up any changes you've made in any of the Preference Panes.
If this does not work either, try this:
Go to Users -> Library -> Caches and move the following to the desktop:
com.apple.preferencepanes.cache and
com.apple.preferencepanes.searchindexcache
Restart computer. See if that does the trick (you can then delete them or put them back - either is fine).

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So just to be clear on a few things:
Should partitioning the hard drive not work is it undoable?
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apollos211,
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azadeh81 wrote:
hi, i have iphone 5 and it's been 2 days that it is not ringing for incoming calls and the speaker option is not working while im speaking . the videos have no sounds . every day i recieved lots of missed calls. i checked all settings related and non related to the sound feature but non were working. i even reset it and erased and reset it but still have the same problem. what shall i do?
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IMac sound is gone, what shall I do???

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