Logic Board/Video Card Problem?

I sue Bootcamp with vista. But my Mac OS X isnt working either. heres the Deal.
I use my computer for gaming and its been great but just yesterday, it had a graphical error. The Screen Flashed Black and back on several times before giving m the blue screen.
It says the problem is that the Driver software couldnt load, so i tried to load my Mac OS, it loaded fine at first, once in inside of any webpage, it was choppy, when i loaded ITunes, it stalled and froze. Now it load at it stalls when i select what OS to go into.
I can load Windows fine, but any time i load it out of safe mode i get green dots across my entire screen while it loads, and the Device manager gives me the error code 43 under Display adapter.
Ive never had a problem like this, my computer is out of warrenty. ive tried a ReFromate and no luck. Heres everything ive attempted so far.
I have installed Current Nvidia Drivers.
Ive rolled back to old Nvidia Drivers.
Ive Reformated my Windows Vista Partition(i couldnt reformate my OS because it freezed with Mac OS X installer Cd inserted.)
Im game for any help and support. Ive been hung out to dry by apple and a certified tech said it was logic board problems over the phone and it would be 700$ for repair. Please help!

Hard to say ... the only way to tell will be to exchange parts and see if it's gone and that kind of stuff could be anything ... it could even be the power supply.
One thing you could try is to run Xbench and check which test makes things worse (not that this really gives hard data, more like adding to the indications).
Another thing is to download iStat/Pro or a similar tool and check the temps. Maybe just a fan gave up and something is overheating. Possibly (maybe) that's why you could get into iTunes and later stalled at the OS selection (because the longer you leave the machine on, the worse the heat gets).
This is all wild guesswork though ... and I doubt a tech over the phone could determine the root cause with confidence (not without running a test software). And for $700 you could buy a 2nd hand iMac8,1 on eBay and sell yours as parts.

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