New build worked. Then broke. Please help.

I just put my first build together and it worked great for two days. The first day I had the computer on for about 12 hours and it worked flawlessly. I was able to play company of heroes and crysis very smoothly. The next day it was on for about one hour and it just shut off. There were no odd sounds and nothing smelt burnt. I have not been able to turn it on since.

Something strange happens when I unplug and plug in the cord from the power supply to the wall and turn the computer. A few lights appear on the back of the graphics card and then turn off and nothing comes on. The fans inside the computer also move as if they are trying to come on but nothing does.

Both the sound card that my MB came with and a green light on the MB always have lights on when the PSU is plugged in and is set to "I".

I don't know what the problem is but I think it is the PSU. How do I get this thing working again or do I need a new PSU? Also is there anyway that this could damage any of my other parts? Thanks in advance for the help.

NZXT TEMPEST
http://www.newegg.com/Product/Prod [...] 6811146047

P5E X48
http://www.newegg.com/Product/Prod [...] 6813131317

POWERCOLOR 4870
http://www.newegg.com/Product/Prod [...] 6814131113

ABS 900 watts
http://www.newegg.com/Product/Prod [...] 6817814013

E8400
http://www.newegg.com/Product/Prod [...] 6819115037

RAM
http://www.newegg.com/Product/Prod [...] 6820231166

640Gb HDD
http://www.newegg.com/Product/Prod [...] 6822136218

DVD
http://www.newegg.com/Product/Prod [...] 6827151153

Vista 64
http://www.newegg.com/Product/Prod [...] 6832116204

Cpu cooler
http://www.newegg.com/Product/Prod [...] 6835118223

I didn't try to doing that with the video card or the RAM. I also don't have any other power supplies around. I think I will take the PSU out of the system until newegg replaces it.