Black screen with XFX HD 6870 on Asus M3N78 PRO mobo

I recently bought an update to my 9600GT gpu.
When I installed the 6870, the pc starts up but there's only a black screen.
I hear windows starting up due to the windows sound playing.

My system is;
Asus M3N78 PRO
4 Gb Kingston
AMD X4 940
OCZ 600W Power Supply

So now I am wondering if it's the mobo or that the card is incompatible with my mobo so that it causes the black screen.
I've googled some and it says it can't be the PCI-e 2.0 caus that's backwards compatible.
2 answers Last reply
More about black screen xfx 6870 asus m3n78 pro mobo
  1. Have you checked the card in your friends PC to rule out that it isnt the issue with the card itself ?
  2. its not a compability issu
    try Pushing the card into the slot and make sure
    recheck the cable between the card and the monitor unplug and plug it again
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