ASUS A7N8X Deluxe power problem

hi there

im posting on behalf of a m8 whos tried booting his comp this morning after its ran fine for months but suddenly it wont power up,,theres a green light on the motherboard lit up but no fans or nothin run after the power buttons pressed.

his spec is as follows

ASUS A7N8X Deluxe
amd xp2600
ati radeon 9800pro
512mb ddr333
400wat psu

any help would be greatly apreciated please as hes in despair.

thnx

this happened to me not long ago
my board somehow decided that after months of using the same ram
it didnt like it anymore !!!
tell him to try taking his ram out and trying it in different slots and maybe lend a stick
as well to try
it could be his psu that has gone as well tho