I have a dell inspiron 1501, ati radeon 1150 xpress, 3 gb ram, 150 gb hdd windows xp sp3. I havent had any problems with playing games on it until just recently. upgraded bios, dfraged, ran crap cleaner, memory and video stress tests came back ok. what it does is it will run just fine, sometimes I can play for hours with my external fan on and spraying the dust out, but the screen will blink black then come back, once I do something it will crash. I redid the heatsink with artic silver and it helped a little. im thinking this is a software problem, but if I knew I wouldnt be asking if someone could help or have had something similar happen to them.maybe its the catalyst control center? I dont know where to go now.