My PC won't boot, the RAM is okey, the HD is okey, when i turn it ON, it's just a matter of seconds then the power goes off, i think its the power supply or the motherboard or the Processor. Any comment?
Could be a overheating issue eg fan on cpu as Alvin.C said check the heatsink fan. Monitor how far it goes into bootup...same time everytime..
Do you overclock ?