Hi, My pc's been working nicely for a long time, but a few days ago while playing Oblivion the image on screen froze suddenly, displaying wide vertical lines of different colors, and the whole pc froze. I had to reboot. Tried a different game, same thing happened after 10-20 minutes. But this time, the pc wouldn't reboot! Lights were on, hd started up, fans blowing, but the monitor showed 'no signal'. And that's it, no beep from the bios. After about 10 minutes of cursing and the like, I tried to start it again, and this time the monitor flicked on, showing squares of different colors, but the pc didn't boot. Pushed the reset button, and voila everything starts up nice again, and no weird graphics on screen. So here I am. At a complete loss. Can somebody help a poor bugger out? Should I chuck this thing over the pier? I don't know what to do Ah yes, my hardware is this: Asus a8n-sli premium AMD Athlon 64 3500+ Corsair Twinx1024-3200XL Pro DDR 1024MB, 2x512 Corsair Value S PC3200 DDR-DIMM 1024MB, 2x512 XFX Geforce 6800GT 256 WD Caviar 250GB S-ATA NorthQ 400Watt I haven't oc'd anything. And the temperatures are fine I think. CPU around 40 degrees C idle, graphics card about 60 degrees C idle.