Yesterday, my computer just cut off for no reason. It "tried" to restart, but would cut off again. I could smell "electrical" smoke from the PSU exhaust fan(I found out the system fan was down, but the CPU, northbridge, and GPU fans are fine), I reinstalled the heatsink on the cpu, but problem persist. I kept track of the temp; the CPU was only at 39*C when it turned off. I opened the computer and set it sideways; and sniffed around to try to find where the smell is coming from. Anyways, it smells like its coming from the PSU; its a Antec 4xxW unit....is this common? or could it be something else?