Just built a new computer with the following specs:

Intel 630
ECS PF4
Corsair DDR2533 512mb x 2 (dual channel)
Seagate 120gb SATA
Liteon s1693s
Gigabyte 6600T Pcie
SPI Green Power 350w psu
Antec SLK3000B
Windows XP Pro with SP2

When i boot up the computer everything works fine. When i turn off the computer and try to boot it up again within a couple of minutes then everything is fine. However, if i try booting up after 5 min or so, the power LED is on and everything seems to be working except that there is "no video input" on my 19 inch philips LCD. In order to boot up my computer i need to manually switch off the power button on the PSU, wait for a couple of minutes and then boot up. I basically have to use the PSU power button which is rather annoying.

I have tried changing the PSU, video card to a 6200TC, ram all to no avail. I have returned the motherboard and the technician says the board is not faulty.

Pls help anyone!!!!

Flash the BIOS.

The PSU seems a bit weak. With which PSU did you replace it?

i've already flashed it to the latest version (ver 1.1f)....tried another PSU rated at 350w....dont have any other PSU....i could try getting a higher rated PSU but will it solve my problem?????

I think a 350W should work, problem is that there are great differences between PSUs rated at the same watt.
Can you post the voltage ratings for each rail?

One other thing, I doubt it is the problem, did you connect the additional 12V line to the mainboard?