HP Pavilion a1750y

I can't get the PCIe graphics card to work using a DVI card. I can get the computer to boot using a PCIe/VGA card, can't get it to boot using a PCIe/DVI card. I checked the BIOS, and it came with a PCIe/DVI card. I replaced the card, same results. Tested the memory, power supply and checked all connections. I tried a different monitor. I have never seen this before, could it be the PCIe slot? I would think if it's going to work with a VGA it should work with a DVI.


Thanks in advance for any help.
Bye Dennis