A5N - can't see PCIe board.

Hello;

I'm building a A8N-SLI machine without the SLI: one PCI-Express video
card (Connect3D X600, an ATI Radeon board.) At boot time, the computer
doesn't see it at all. Fan is spinning on the adapter. There's one low
weird beep from the bios followed by two very short ones at boot time
(beeeeep-ep-ep). It's not like the beep when the video cable isn't
plugged in. (beeeeeep-beep-beep)

Now, an ancient S3 PCI card works perfectly. I get a video signal, see
the screen etc.

For the PCIe, I have switched the Asus key to single from double and
set the bios to "Normal".

Other details:

A8N-SLI, BIOS 2002.
400W PSU (20 pin, not 24)
Athlon 3200+ (2GHz detected)
1G Kingston DDR400 in two sticks on A1 and B1. (detected correctly)

This is supposed to be a 1-card system. (I bought it for the non-SLI
stuff) So, I guess I don't need to plug in the molex near the PCIe
slot. (Red light isn't on anyway, which squares with what the manual
says.)

Any help is appreciated. My suspicion is that the video card is either
incompatible or broken.


Brian.