Equpiment involved: Biostar Geforce 6100-M9 Motherboard Nvidia Geforce 8800 GTS GPU Another old crappy known working GPU Yesterday I came home from university with all my stuff, including my PC. When I got back, I set everything back up as normal, and the screen did not show. First thing I did was check all my cables were in right, and after it still did not work, I opened up my case and resat the GPU - still no luck. I took out the 8800 and put in my old graphics card that I know works into the slot and still got nothing. I then plugged in to my onboard graphics and the screen showed up. Now that I can actually see the screen, I checked the BIOS for any changes, such as maybe disabling the PCIe slot, or changing it to the onboard graphics, but nothing had changed. The weird thing is that I then changed it so that it used the onboard graphics by default, and plugged the 8800 back in, and still didn't get the screen up. It seems to be that whenever something is in the PCIe slot, the screen doesn't display. I took the 8800 back out, and booted up into windows using onboard graphics. I updated my chipset drivers, and also flashed the BIOS with the latest firmware I could find for the motherboard - still got the same problems. So any ideas guys?