I just got a neo he 500 power supply today after my old one died, and so I install it and when I cut it on for the first time it runs fine. But after about 45min of being on the my system just cuts off. So I turn it on back again and this time it only stays on for about 15min. At first I though maybe something was overheating but everything was normal, including the power supply temp. Right now my system will run only for about 5 min