ASUS P5W only boots sometimes/needs 2 GPUs

Marco_50

Prominent
May 2, 2017
5
0
510
Hello!
I got this Motherboard. At the time I can't tell the BIOS-Version, it won't boot at this time.
Yesterday it worked properly with a Pentium D 945. They I put a Pentium 4 670 inside. This worked, for the first time.
Today I tried to boot up. Nothing. No beep-codes, no video output (CRT is working)
Then I made a CMOS-Reset. It booted up 1 time (I set the time in BIOS). After pressing F10 and restarting, it wouldn't boot up again.

My next step would be to upgrade to the latest BIOS.
Might that be helpful?

Another curiosity is, that I can send video signal if 2 video cards are installed (only the card in the top PCIe slot is working, the other one isn't detected by lspci and has no signal). The card are GeForce 210 and Radeon HD 6750. They are both working.
If I exchange them, the other card in the top slot is working. The card in the slot at the bottom is not working.
Memory (4x Corsair 1 GB 6400) has been tested without failures with memtest86.


How can I fix that?

Kind regards