I I picked up a used Gateway GT5628, with the intention of using the Quad Core CPU in another motherboard. I replaced the Q6600 Quad Core CPU in the GT5628 with a Core 2 Duo 3.2 GHz CPU, reset the BIOS with the reset jumper and now it will not POST. The fans come on at high speed, but the screen remains black. The BIOS is version DPP3510J.15A.0261.2007.0723.2348 , which I think is the initial version. Please help!