Sorry, didn't literally mean I heard a "pop".
Card is (was!?) an 8800GTS and not overclocked. Win 7 64bit. Core 2 E6600. Asus P5WH Deluxe. 4 gb ram.
I've tried completely removing all drivers and re-installing but hasn't worked. Not susprising as the artifacts show up on the bios post screen. I'm 90% sure it's the card. Just confused as I'm sure that in the "good old days" if the video card died you wouldn't even get past the bios post.