PC overheats when not used for 5~10 minutes.

Whenever i leave my pc untouched for more than 5 minutes, I come back to a very hot room with all fans turning on full speed. If I leave it for longer it starts smelling burnt.

After I move the mouse, the pc freezes for a 5-10 seconds in which all screen turn black, after that it works as normal and the temperatures drop again.

Does anyone know why this is happening and how I can prevent it from happening again?

Submitted June 01, 2017 at 01:42AM by FunkAvenue http://ift.tt/2rlfmTe