Internal microphone not working on iMac

My Inernal microphone is not working and I have tried the usual remedies:
1.)  Reset the NVRAM/PRAM by doing the Command+Option+P+R
2.)  Checked the Sound Preferences to make sure the Internal microphone is selectyed, Mute is unchecked, etc...
3.)  I tried to do the Apple Hardware test (AHT) but that did not work.  It just booted up normally when I held down the "D" key.
4.)  I don't have Skype or Garage Band operational and I am not using any external microphone.
Any suggestions?  I saw a post about deleting the "plist" but I left the post and couldn't find my way back to it again.
If I jack up the Input volume all the way I do see bars registering (on and off) on the Input level scale but no amount of shouting at the microphone generates any new bars.  I just had the hard drive replaced with a new Hitachi hard drive but the iMac seems to be working fine other than the internal microphone.  This al started when I tried to do facetime but the other party could not hear me.
I am using Mountain Lion 10.8.2
Suggestions are welcome and thanks.

If I jack up the Input volume all the way I do see bars registering (on and off) on the Input level scale but no amount of shouting at the microphone generates any new bars.
It looks like your mic has really ended its life, however that happened. The bars you describe indicate that the mic input is open (and subject to interference, but no good signal from the mic itself).
You will easily agree that any - costly - repair won't be worth it. See if you can get an inexpensive external USB mic, or one of these external USB sound "cards" that offer an analog mic input, plus a mic.

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