Graphics 6800GS and Abit AN7/Powersupply problems?!

Several times when I have booted my computer I have had fuzzy lines and fuzzy pixels flashing across my screen both in the bios and when I get into windows.. ocassionally the problem just occurs in the middle of any activity!? I think its either some problem between my motherboard and graphics card or a powersupply problem my 12v line is currently sitting at 11.8V is that too low? and the agp voltage is 1.6 could that be too high? Its a BFG model so overclocked by default but my sys temp is about 34-38 deg C which seems fine to me? Anyone else had problems with Nforce 2 boards and 6800GS cards?? I have flashed to the latest bios to try and fix this. I would appreciate any help solving this problem.

 

You say sys temp, are you sure that is the Graphics temperature? It probably isn't overheating, as you say it is from boot. Worth checking. Probably not a driver problem either, as it does it in the BIOS.
Check that the card is seated correctly in its place, and check power connections.
It sounds like it could be memory, though

 

11.8 volts isn't optimal but it shouldn't cause any problems. Try clocking your card back 50MHz on the memory and see if the problem goes away.

 

I think it is the same with most GS's, allow me to explain. I had an MSI 6800GS and a 500W PSU and got slight corruption on boot up, a quick press of the reset button cured this. The guy I sold it to has the same problem and another mate has a 6800GS and that does the same.