10.6.8 - No audio out (but internal speaker fine) - MBP5,5

After upgrading to 10.6.8, plugging in my earphones or headphones does squat. My internal speaker still works fine though
I've tried the AppleHDA rollback (to 10.6.7 version) to no avail - each time either audio disables totally or I get the "Incorrectly installed extension" error
The most interesting thing is my problem seems subtlely different from the 'popular' audio problems. Most bizarrely, audio out works until I log in (works on the login screen). It dies and I receive asserts on the console after logging in though (I'm not on the machine and I can't remember the exact assert message but something about failure during GOTO in some audio handler)
I haven't tried making another user account (to see if it's account specific) but I have tried deleting all manner of user-specific audio plists as well as doing SMC reset, permissions repair etc.
Any ideas? + Anyone have the same problem? (I'm presuming this is specific to this MBP + config)

one thing i have just tested i can copy files from my mac desktop to my macbook fine mmm!

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Hello David,
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NG

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Hello Nitadoo,
u can make a new id and password by going to apple.com and clicking on the forgot id and forgot password button in login.
also u can go to a nearby apple store and tell them that u want a new apple id and password
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http://www.griffintechnology.com/products/imic

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Hello,
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10.6.8 - No audio out (but internal speaker fine) - MBP5,5

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