The power supply in my PC is shutting down after 20-30 minutes. After awhile I can turn it back on. I think it's because the power supply's fan isn't moving. If I poke a screwdriver in and start the fan, it WILL turn for a little while but eventually stops again and the cycle starts again. Can I spray WD40 in there to lube the fan? Or do I need a whole new power supply. The PC is only 1 year old.