I have a HPa867c for starters. The mobo died and I purchased an INTEL D945GCL 1066FSB DDR2 PCIe X16 SATA to replace it. I installed the mobo into the tower making sure heatsink compound was in place, all the cables pulled and the placed on the new mobo one at a time, to insure that all cables were in the correct ports. I have double checked all connections to insure proper placement of the cables,had the power supply checked, pulled everything lose and applied one at a time to see if there was and issue elsewhere. I have power to the board because the led light on the board lights up. I have put the Intel P4 3.4 in properly and still have no reaction out the tower when I press the power button. Can it be as simple as a power switch gone bad or is there something I am missing here? There is a connector on the board for power/led but I have no cable to apply to this connector. HELP!!!!!