Hey all. I just recently built a computer (my first time) and it won't boot up at all. After I turn on the power via the switch in the back, the computer turns off itself within a few seconds. (It's strange that on other computers, I flip the switch and then have to manually turn it on via the power button but this one turns on just after flipping the switch) The computer is an: Athlon 64 3500+ Newcastle core Aspire 480W PSU 2x512 (Crucial?) DDR PC2700 Plextor DVD+/- Burner Asus A8V Deluxe Mobo Any help would be greatly appreciated. I'd take it in for diagnostics but figured you guys could help me out before I shell out $40 just for that. Thanks a ton.