Hi, I have an older alienware that has started playing up and i'm hoping someone can point me in the right direction.

Every few minutes the front fan will come on just for a second, then the fan on the right hand side for a second then go off.  But for those 2 seconds, the machine will lock up completely every time.

Thermal paste hasn't long been re-applied to the processor so any idea what else i can try?  Thanks