Windows XP Startup Problem

[garain]

I recently had problem with my old pc and it will not boot. Every time I press power button to start power light will come on and in 2 seconds computer will go off. I thought my 2001 gateway is old or has burned something so I changed mother board ( that was my excuse to buy new one any how) and installed Intel Mother board and intell celeron 2.0 GHZ processor and every thing worked fine. I downloaded all the upgrades and activated my windows xp. next day I tried to restart and it has same problem. Computer will not start ot it will turn off in 5 seconds. I was able to boot system from cd and reinstalled windows xp with service pack one but problem persists can someone help to solve this problem

Thanks,

Ghulam

[ktkendall]

My assumption here would be that you have the same power supply still from when you were having problems the first time, so being that the MOBO is new I would try a new power supply.