Hi I just built my first PC. I'm pretty sure everything is in place. I put in an Asus P5LD2 mobo, P4 3.2 ghz, GeForce 6600 PCI exp vid card, 1 gb DDr2 ram, i used my old HD ATA 60gb. PSU 380 watt My problem is when i start up everything appears to be normal. i go to my bios, but after about 1min my computer shuts off. the light is on on the mobo. i checked, rechecked all connections. any help would be much appreciated.