Need Help guys...

I got the DFI DK P45 T2RS PLUS along an E8600, 2 x 1GB Team Xtreem PC2 9600 (1200MHz) and a Palit 512MB HD4870 Sonic Dual Edition (the 1 with 2 fans). When I connect my 4870, I get 1 long beep...at times a few small beeps and the Diagnostic LED goes as it normally does but I get no display :@

I tried with 2 different PSUs (tagan 800W & Corsair 450W)...it worked with my nvidia 7150 but get no display with the 4870.

The 4870 worked fine on my other PC but it refuses to dispay on the DFI DK P45 PLUS...on both the PCIx slot.

I even updated to the latest (non-beta) BIOS on the DFI website through the other GPU but it still doesn't work.

Is there a compatibility issue ??? or do I need to do some jumper setting ???

PLS help me out guys...this is my 1st DFI and my cuz got it 4m Canada as there's no DFI in INDIA.