About a year ago I built a PC for my friend. In the last 6 months or so it has decided to randomly restart with out any warning etc. For the first 6 months of it's life it was fine with no problems. I feel it is a result of the hardware we have added to the system. Which is another stick of 512 mb RAM. An additional Hard Drive, and a replacement PSU as the last one went pop. I am pretty sure it is not down to the additional Hard Drive.
I have noticed whilst in the BIOS the voltages of the 5+ and the 12+ do fluctuate up and down. Is this normal. The PSU was cheap.
Hope you can shed some light on the matter.