Let me just say that I've googled this problem for five hours straight now, just so I don't get the "duh - try googling" response straight away. When I try to play games the screen locks up after a few minutes, and I get grey/white/brown lines on the screen before the program shuts down. When I am back in windows (and to a certain degree when I'm in the bios menu) I get thin horizontal lines on the screen. Sometimes the screen goes black and I get an error message about how the display driver could not be loaded. (Or something like that, I forgot to write it down). It's weird, because I didn't have this problem yesterday. I played Dragon Age 2 for hours then. My system specs: Windows 7 64-bit OS Asus P5B motherboard Intel dual core 6600 @ 2,4 GHz CPU 8 GB RAM Ati Radeon HD4870 1 GB video card ATX 530W PSU I've updated the Motherboard BIOS without any effect, and my Driver Packaging Version is 8.831.2-110308a-115928C-ATI Apparently this is a relatively common problem (according to what I've found while googling) and I've read that updating the video card BIOS could do the trick. I haven't been able to find out how to do that though... It's frustrating. If anyone can help I'll be eternally (well, for quite a while at least) grateful.