Well you are not alone. I am trying to install an ATI 2600 PRO (pci-e) in an ASUS pv4800d-x board and I get the same response. The new PCI-E card does not show up in device manager (when booting with the old card and the new one both installed). If booting with just the new card, blank screen, one long beep and three short ones.
Note that I have exchanged the card for a new one and the results are exactly the same.
I suspect possibly the PSU (only delivers 18 amps on the 12v line, the card should have about 24 amps) or possibly the slot on the main board is non-functional.
Other miscelaneous info: the fan on the 2600 pro runs, so its getting some power. Also, if you boot with no video cards, you also get the one long and 3 short beeps.
And, like you, if I go back to the old card, the PC runs fine.
Have tried:
- reseating the card
- reinstalling the o/s
- resetting the bios (remove battery, switch jumper for 10 secs)
Unfortunately I have no other board to try the card in.
My setup:
o/s: vista
mobo: asus pv4d800d-x
ram: 512 Kingston (Asus approved model)
old video card: ati 9250 (pci)
new video card: ati HD2600PRO