Problem solved. Its my power supply. I made a mistake on my build. I gave my son a thermaltake 850w. I put in mine the one he was ment to have . A crappy cheapo 750w. A £20quid special. So off the bay tonite I bought a pc power and cooling 850w used. Its about 2yrs old. Had little use. But has a 5yr warranty

. Cost £37 with delivery
So if anyone else has this problem its due to your power supply. In other words replace it