Hi, my PC is brand new with good hardware and have been having slight problems with games. Sometimes I'll be playing a game and the screen goes blank. It says here is no signal, although the computer is still on. I have to manually turn of the computer to get back to windows, as Alt-Tab/Alt-Ctrl-Del dosent work. Heres some Specs if it helps AMD 64 Athlon 3400+ ATI Radeon X800 XT 256 MB 1024 MB DDR RAM I like to run my games on all the maximum graphics settings, so could the video card be over heating? Also if it helps, sometimes my USB ADSL Modem crashes with the blank screen and needs to be unplugged and re-entered before it works again. Any help would be great, DJ.