Dell :: 7900 Gs

I have a 7900gs single pipe and I have had it overclocked for some time (probably a year or a little less) using joker's rom cd. I had it at a medium or so overclock however ...I think 430/600 or something like that so I wasnt really pushing the card too hard. Anyway, I was reading a page on the internet today and started noticing some artifacts and the screen would go blank and then come back on. I immediately turned it off and rebooted normally. I noticed even on all the boot screens it has artifacts and in DOS mode, you can barely read anything because random letters and stuff are everywhere. It will not boot normally but can still boot in safe mode and in VGA mode. I've tried putting it back at stock clocks, reinstalling the drivers, bios, chipset, basically everything but windows itself seeing as it shows artifacts even out of windows. When I try to run ATItool it says there is no video device detected but my device manager shows the 7900 gs running normally. Unfortunately... I have the feeling my card is fried...