Building New Computer, No Display, Please Help Me Correct Problem

[CornDog]

I am in the process of building a new computer.

Mother board: Gigabyte GA- 8IPE1000 Pro-G
Processor: Pentium 4, 3 GHz, 800 MHz FSB
Memory: Mushkin DDR 1 GB PC 3200
Video Card: Gigabyte ATI Radeon 9250
ETC

Here is the problem I'm having:

I installed the MOBO, Processor, Memory, hard drive, and video card. Booted the computer just to check before proceeding. The CPU fan starts, but I don't get any video. I thought that maybe it was the video card, so I removed the new card, and installed my old working video card. Still nothing. So I thought it was a problem with the mobo. I returned the MOBO. The new MOBO arrived today, and installed it...still no video. So then I removed the new processor, and installed my processor from the old computer, the one I'm using to post this, still nothing.

I have built three computers before this one without problems. Can someone please help me figure out what is causing this problem?

Thanks.

 

[daappleby]

does the vid card have an external power input? If so make sure you have plugged in one of the power plugs. Also do you have to correct RAM?

 

[aspire]

power supply?
my guess is that your power supply is crappy and cant power the system

 

[CornDog]

Problem solved...Thanks!

Hey Guys,

Thanks for the help. The vidio card does not have external power. I took the power supply (Vantec) out and replaced with a known working power supply. The new power supply is defective. Thanks so much for the help!