This system is all brand new and put together just this morning. Motherboard: Asus P5N-D Memory: 4GB DDR 2 pc8500 CPU: Intel Quad Core 2 2.66 Ghz Heat Sync: Antec Performance Max 92mm fan 3 heat pipes Video: Gigabyte Geforce Gts 250 1Gb DDR 3 PCI Express Power: 850W Cooler Master Silent Pro Chasis: Antec P183 Anyway this is my second system build and everything went wonderful on the first time powering it up. Everything came on and the system detected all my Hard Drives and the DVD rom. I put in my copy of windows seven and went to install the 64 bit edition of the ultimate. Windows then went on to try and ready the files. At this point I leave the room for a quick call of nature while the system does it's thing. When I came back the computer was all shut off and when I go to push the power I get nothing but a quick flash of the light from the fans. The green power light on the board is fine and when I plug a monitor in it detects that its attached to the video card. So I disconnect the power and reinsert the main power cords on the system for the cpu and the board. Plug it back in the turn the power supply on and get the little green light. I hit the power button and again all I get is a quick flash of the fans and lights. I have no idea what might be causing this but the system was running good for a full five mins. Anyone have any ideas as to what might be causing this.