I have a Compaq Deskpro EN 133HZ, Pentium III machine running Windows 2000 Professional. It has an onboard VGA input. I recently upgraded the memory to 256. I just purchased a Diamond Stealth ATI Radeon 9250 PCI video card. My machine fits all the minimum system requirements of the card. When I start my PC, I do not get any display. When I swap my VGA plus back to the onboard port, I don't get any display either. I've tried disabling the onboard VGA port in BIOS, but am not 100% sure where that might be; let's just say the bios is pretty simple and doesn't seem to have this kind of detail. I've tried reseating the video card multiple times. I can plug a NIC into the same PCI slot and it works, so it's not an issue with the PCI slot. I've also tested the S-Video output to my TV, to see if it was an issue with the VGA port on the card, but that didn't work either. I am completely out of ideas. Any suggestions?