My computer randomly restarts for no reason.

how many CD or DVD drives you have ? does your graphic card need external power and how many was does your power supply have ? check all those maby the powersupply maby overloded if u have 2 CD roms disconnect prow on one and try may help if it is he issue you kow what to do change he PS that has a higher amount od watts

 

I think it is Multi-tasking. Windows Is Running a lot of things and has to deal with them all at the same time. This Particularly happens with DVD Burning, as it uses up a LOT of memory. This Could Be The Problem.