I installed my NVidia 7800 GTX PCIe in my dx5150 MT, after upgrading
my power supply to 550W. The video card is connected to the PS as
well. I have "PCIe" selected in the BIOS as the preferred video.
About half the time I boot, the NVidia card works and I can use my
dual DVI monitors just fine. Other times, the card is not recognized
at all and I have to flip the DVI cable back to the onboard ATI DVI
When the card is not detected, Windows Device Manager shows nothing
except the ATI adapter.
What else can I try to get my NVidia card to work reliably as my