MBP Retina No Sound Output device found

I use my MBPR with thunderbolt monitor and often use the 'Display Audio' option when plugged into them.  2 days ago, when I unplugged the thunderbolt monitor, there was no longer an 'internal speakers' option in the sound prefs pane.
It does still show the 'Display Audio' option when plugged into the TB display, however that is the only audio option now, other than any available airplay devices in range.
I did SMC reset & PRam reset, multiple times to no avail.  I then called apple support and they walked me thru the same things, as well as eventually deleting these 2 plists from the library > prefrences > audio folder:
com.apple.audio.SystemSettings
com.apple.audio.DeviceSettings
This also did not return the audio device to the sound prefs pane.
I had a friend with the same laptop, same specs, send me his version of those plists, as mine were missing sevral keys that his had.  None of that worked.  Wondering if anyone else has seen their internal audio device disappear on the MBPRs?  I read up on HDMI audio threads, but the their problems seemed to be with MB Air & not very relevant to this problem.
Thanks.

Hi-
Does the G4 make the start up chime?
In System Preferences/Sound/Output, is the "Mute" button selected? Is the volume set?
Do you know that the internal speaker worked before you got the G4?
Have you tried headphones or speakers in the sound output jack?
If the output jack isn't shown in the preferences, and you have no chime on start up, you may have hardware problems.
Just for fun, try a PRAM/NVRAM reset:
http://docs.info.apple.com/article.html?artnum=2238
Maybe the sound problem is why the machine only cost you $20...........
G4 AGP(450)Sawtooth   Mac OS X (10.4.8)   2ghzPPC,1.62gbSDRAM, ATI9800, DVR-109,(IntHD)120&160,LaCie160,23"Cinema Display

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