Hello Today I experience the oddest thing I have ever seen on my PC. This morning the power on button would not start my PC. I checked the cable and the wall socket and popped the case to look inside. Nothing seemed out of the ordinary. I turned the case on its side to get better lighting inside and the PC started right up. I was surprised at that so I stood it back up and it shut down. I hit the power button and nothing happened so I tilted it on its side and hit the button and voila, power. So I let it boot and after its all done and windows is up I can use everything normally with no issues. I turned the tower back up and it stayed on. Not 2 minutes later it shut off again and immediately restarted. The second time it did this it ran a disk check (Im assuming because of the sudden shut downs) and it turned out fine. Right now the PC stays on like nothing is wrong when its laying on its side. As soon as I stand it back up it shuts down within a minute and restarts. Its a Dell XPS 420 Intel Core 2 Quad Q6600 @ 2.4 ghz 3 gig ram 32 bit OS Windows Vista I have installed: Nvidia 9800 +Extra Case fans This PC has worked flawlessly since I bought it a year and a half ago (and immediately installed the card and fans). This is the first issue I have had and it feels like some sort of power short, rather than an actual PC issue. Any ideas? Thanks in advance.