garble characters on the screen - especially in the BOIS setup screen indicate the memory on the graphics card is damaged (if it were just when windows is running then it could have been a couple of things) - but if its like with with just the BOIS running then the card has over heated and the memory damaged. -
adding another piece of hardware would maybe have sent the power supply over the limit and caused irratic fluxuations in the 12v rail and damaged it but I doubt it. maybe a chassis fan was disconnected.
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by: garycasePosted on 2007-09-22 at 01:08:27ID: 19940942
Almost certainly power (which you have somewhat eliminated) or bad video memory (i.e. a bad card, since the memory on the video card isn't reasonably replaceable).
If the issue is a bad 12v bus on your PSU, however, the test you ran wouldn't necessarily eliminate the PSU ==> you MAY have been drawing too much power and blown a 12v bus on the PSU ... in which case removing load now won't help. The best test, of course, is to try both a new PSU and a new video card ==> if you have a spare of either available I'd try that [perhaps try a video card from a different PC].