Boots, then shuts off.
 

Alright, i just put another computer together a moment ago. When i start the computer up, i get all the fans along with the cpu fan going. The LEDs on the case light up, and the HDD starts up. There is no input on the monitor, and after about 5-10 secs from booting up it shuts off on me. It's a 420W power supply, nothing special in it. A basic GPU, one HDD and 2gb RAM. I am somewhat new to building computers, i built this one im using with no problems but i don't have the experience to know for sure whats wrong with this other one. Any help would be much appreciated.