I have a ASUS P5KC Motherboard in which i am building a system around. I have a brand new Diablotek 500watt ATX power supply, New PNY 2Gb DDR3 1333MHz ram stick X2, New Nvidia GeForce 8400GS 1024MB DDR3 Video Card. 500GB SATA Hard Drive, New cables, etc.... It had a P4 800MHz processor. Will be upgrading to an Intel Core Duo E8400. The problem is, I have everything installed with the intel P4, and when i powered up the system, no video, no beeps, the fans run for 10 seconds, shut off, then start again. I've changed power switches, reseated everything including the Mobo, and still the same result.