Arg computer won't even power up..

[Packin]

Just finished building a comp with these specs:

P4 1.8A
Gigabyte GA-8IRXP mobo
MSI Geforce 4 ti4400
350 watt Enermax power supply
256 mb kingston pc 2100


I got everything hooked up, and connected the keyboard, LAN, monitor, and power cord. Nonetheless when I turn it on, the LAN light lights up. Then when I go to press the power switch, the cpu fan turns on for all of one second...I'm going to switch out my power supply and see if that's the problem but I really hope not as I only have a 250 watt from my old comp. Please help!! Thanks!

Tried the 250 watt supply and same results...as an addendum, all of the fans (case, cpu, video) turn on for bout a second EXCEPT for the power supply fan. I have also reseated the video card in case of a short or something but the fan does turn on... What's wrong??

 

[olds]

Some mobos will not start if you don't have the CPU fan plugged into the proper fan header. This is to prevent frying the CPU. I don't know if yours has this feature but that sounds like your problem.