MA790X-UD4P + Xonar Essence STX = No POST

[Apokalipse]

Okay, so I bought a new Xonar Essence STX.
I put it in my PC, and I get no POST. Tried all the other PCI-E slots, same thing.

But, it works fine if I have my Xonar D2X and a PCI-E SATA controller installed.

The Xonar Essence STX also works fine if I install it in another PC. Just not with the MA790X-UD4P.

BIOS is the latest version (F7)

 

[Apokalipse]

Well I discovered something interesting. The only PCI-E slot it will work in is the first PCI-E 16X slot (normally used for the graphics card). So now I have one of my 4870's in the second PCI-E 16X slot, and the Xonar Essence STX in the first PCI-E 16X slot.

 

[kmote]

Huh, that's weird, you thinking it could be an interrupt problem or something?