I have a HP Media Center m7470n that has integrated ATI Radeon Xpress 200 Graphics. I upgraded to Windows 7 but it was pretty slow with graphics so I upgraded the power supply and tried to install a Nvidia GeForce 210 1024MB DDR2 graphics card but when I do that I lose all video signals and my monitor powers down. I have tried enabling the PCI express slot as the primary slot in the BIOS. I have reverted back to Windows XP Media Center Edition. I have uninstalled the integrated graphics drivers. Still every time I plug the card in plug and play doesn't detect the card and if I tried to manually install it in device manager it still can't find it. If I try to reboot with the card in my monitor won't get the signal feed. The motherboard is a MS-7184 and the BIOS is updated. I'm beginning to feel that I'm missing something obvious. What am I doing wrong?