Hello i recently purchased a 2nd ati 6950 graphics card to put it in a crossfirex config and it works perfectly but with the second card in there is not enough room for my power button connectors to fit on and still have enough space for the card to sit in the slot. any adapters or anything to get around this its a pain to have to reach in my pc to start it. my mother board is http://www.msi.com/product/mb/P67A-GD65--B3-.html
I think you need to look around and route the cables differently. Or take a picture of the inside of your case. The card does not look to be in the way of the actual jumpers so it should be a matter of routing the cables.
I got the exact same motherboard. It make a great hackingtosh PC for Lion.