Re: computer doesnt turns on for 1 second then turns off help!!!
what the other guy meant by setup is what are your specs, like mobo, CPU, vid card, etc.
If its not your PSU, then its either your mobo or CPU like the others said.
Try to get an extra one, like barrow one from a friend.
Do you usually get post beeps when you first built it? (might sound weird, but not all mobo has post beeps, like mine)
Desktop -Cooler Master NV690/AMD Phenom II X4 965 BE/MSI 880G-E45 Motherboard/2 x 2GB DDR3 G.Skill Ripjaws X/Sapphire HD 5870 1GB GDDR5/CORSAIR CMPSU-550VX/Seagate 7200.12 500GB (OS), Samsung F3 1TB (Storage)/Sony DVD Burner/Windows 7 Professional 64-bit