Sound completely broken, except for bootup sound

My Macbook Pro won't play any sounds, except for the mac startup sound. When I try to play a sound, the screen flashes as if I had universal access turned on, but I don't. This happened after I tried to repair disk permissions and verify the disk to try to get bootcamp to work. I had also just started using the Parallels virtualization software. There's also no sound when using the headphone port, so this definitely looks to me like a software issue. Is there any way I can repair/verify the audio drivers?

JP - Be sure you've checked the simple stuff. Since
you didn't mention this...
Run System Preferences, select Sound and then the
Output tab. Is the volume at zero or the Mute box
checked?
Click Show All, then choose Universal Access and the
Hearing tab. Is Flash Screen checked?
Failing both of those, try dragging <your home
<div class="jive-quote">/Library/Preferences/com.apple.soundpref.plist and
com.apple.universalaccess.plist to the desktop. Log
out and back in. Any joy?
I tried this (and resetting the PRAM), but still no luck. Interestingly, the soundprefs file was re-created, but I don't see the universal access prefs file getting re-created, even after trying to set/unset universal access settings.
One more thing I noticed: iTunes also won't start, giving an error code of (-200).
Good luck,
John

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Black screen: This is usually a sign of a failed logic board. There is no single reason for this and this may be caused by failed GPU, screen, CPU or RAM.
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[edit]
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If that doesn't help continue doing the steps from below:
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5. Boot from install disk. Boot from the disk that came with your Mac. Hold C while booting. Select Disk Utility from top bar and repair permissions and verify the disk. Reboot normally and see if it works now.
6. Boot from another Mac (Firewire target disk mode). Connect the machines with a Firewire cable. Power on your Mac and press T. Select the other Mac's hard drive. Download the current OS X combo update. Run the combo update installer and select the drive that won't boot as the destination.
7. "Repair" OS X. Boot from the install disk as in point 5. and reinstall OS X. This should NOT erase any data, just replaces the system files which may have caused your booting problem. Now install the latest combo update for OS X and repair permissions on your drive with Disk Utility.
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8.1 Reinstall OS X. Boot from the install disk as in point 5. and select Disk Utility again. Now erase the whole hard drive and install OS X again. If you had a Time Machine backup and step 7 worked you don't have to do this.

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