10.6.8 update Macbook Pro (2006) audio dropouts

Hi, I've got this nightmare problem, since I updated to OS10.6.8, my Macbook Pro late 2006 drops the audio, randomly, rendering the whole caboodle absolutely useless as a studio tool. It still works out of the headphone output, but not with my MOTU 828, or an M-Audio FW interface I tried it with either. Seems to happenw ith Logic, iTunes, whatever.
Has anybody else had this problem, perhaps suggest a solution? One Mac expert said he thought it was a firewire port issue, and nothing could be done without replacing the motherboard.
There was a wierd glitch with saving/storage afer 10.6.8 upgrade, and I used this fix..http://support.apple.com/kb/TS3968
Don't know if that could have affected anything..
Thankyou Mac world people.

Did you follow these steps, EXACTLY?
http://support.apple.com/kb/ht3964
Note: Learn about removing the battery on MacBook and MacBook Pro.
Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
Remove the battery.
Press and hold the power button for 5 seconds.
Release the power button.
Reconnect the battery and MagSafe power adapter.
Press the power button to turn on the computer.

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Helpful Apple Support Resources (Forum Overview)
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http://manuals.info.apple.com/en/Boot_Camp_Install-Setup_10.6.pdf
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10.6.8 update Macbook Pro (2006) audio dropouts

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