Sound randomly goes on and off on my IMac

I have a 2006 IMac that works perfectly except for one thing. One day last year out of the blue the sound stopped working and I would get the 'not allowed' circle when I tried to adjust the volume. the problem persisted for a week or so, then the sound just came back on. Everything was fine untill a month ago when the same thing happened. I did some research and tried the toothpick trick and everything related but nothing worked, then the next morning the sound was on. Over the next few weeks the sound would go on and off randomly for no apparent reason. It has now been off for two solid weeks and I don't know what to do. Is it possibly a loose connection inside the computer that just needs to be plugged in? Any help would be greatly appreciated.

Performing both of these usually cures the problem:
Resetting the SMC (System Management Controller) on Intel-based Macs:
http://support.apple.com/kb/ht3964
Resetting your Mac's PRAM and NVRAM:
http://support.apple.com/kb/ht1379
There is also the 'Garageband trick': Open Garageband, play a loop, close Garageband, then reboot.

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