Why does my internal speakers no longer show up in my sound preferences?

In February, I updated my MBP 15" to 10.7.3. After restarting my system, the internal speakers were no longer listed in my available outputs under my sound preferences. I wasted an hour of my time talking to phone support only to hear the same stuff I had found online to try to troubleshoot the problem. Finally they told me to go to the Genius Bar. I went to my local Apple store where they proceded to look at it for about an hour and in the end told me the way to fix it would be to just wipe the harddrive and reinstall OS X. I couldn't afford to do that at the time due to needing the computer for grad school and chose to wait till after school let out to do this. Now I have wiped the harddrive twice and reinstalled and STILL don't have sound.
Does anyone have any ideas of what I can do to try to fix this?

It's a longshot, but you could try this:
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Why does my internal speakers no longer show up in my sound preferences?

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