Hmm... there is a problem of earthing in our room(there is no earthing

). But well, i have kept my own laptop very carelessly in the same room, and its still running like a jet..

. No moisture problem. There is insect problem, but there's nothing in the cabinet as yet...

We took a shop here and he changed the psu to the coolermaster 500W Ext pwr. But still it didnt work.
Ram's fine. took it to a friend's place and used there.
Connections are as tight as a screwdriver can screw it in...

We have got a DVI connector thinking the D-sub one might have some problem. It was the same problem. Altough when it ran, it ran with the DVI one only. Exchanged and tested all the ram and sata slots avaliable as well.
Havent checked the temparatures properly, but there's no spike anywhere. Its like normal HDD rotation is there, fans are running properly. But the <peep> sound that comes during a proper boot is not coming. Might be because the internal speakers are not connected, but i cant be sure.
Hmm if it helps in any way... there's little connection problem in the cabinet. The power light and restart button dont work at all. Never did.
Thing is that it did run properly for 2 weeks... under same condition. Suddenly it stopped working again like earlier.