my comp was loyal 2 me until a few months from now................. now it starts well some times n doesn't some times<like most of the times> the processor fan runs n the power led glows but there is nothing happening in my comp. no post, boot and no beeps also. i can feel the south bridge heat sink to be hot but i don't feel north bridge n the processor heat sink to be hot when the above problem occurs. it occurs randomly. THE PSU IS FINE!!!!!!!!!!!!!............. my config>> P4 3 ghz 1gb ram 80 gb HDD MB = mercury PI915GLM PSU = 400 watts.