Few minutes later I went to see why and turned it back on, and me having a see-through case with lights I saw that the CPU fan wasn't spinning and saw the temp readouts on the front of the tower for CPU rising quickly so I shut it off.
I opened up the case and blew the fans out with compressed air and checked the CPU fan's connector to the mobo -- all good. Made sure it was secured and put the case back together.
Fired it up again, and it's still not spinning.
It's a custom heatsink, Arctic Cooler brand i believe on an Intel Pentium 4 3.2GHz not sure of the socket off-hand.
Is there anyway to fix this or is the fan shot and I need a new one?