I tried searching the forums but I couldn’t find anything so here it goes. Yesterday I tried making a new computer for my brother, but something went wrong. This is the 4th computer I built so I know I hooked up all the cables correctly. I have almost the exact system I am building for him on my own computer with the specs below. After I hook everything up I plug in the monitor, power cable, keyboard, and speakers. The computer turns on, but doesn’t boot up so no bios screen comes on. Actually nothing shows up on the monitor. I know the monitor works since I tested it on my own computer. After the computer is on for 10 to 20 sec it turns off all of a sudden. After a few more seconds the computer turns itself back on without me touching anything. This cycle continues until I manually turn the computer off. I think it is a psu problem but I’m not sure. Please let me know what you guys think so I can fix the problem.
Motherboard: Gigabyte GA-EP45-UD3P
CPU: Intel Core 2 Quad 2.66 Ghz
PSU: Corsair 620 watt
RAM: Corsair 2x 2GB sticks
Graphics: Geforce GTX260 896 MB
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