My brother built a new PC and now, when he turns it on the fans spin up and then it just goes off! It takes 3 attempts and then the PC stays on fine. This happens evertime he turns his pc on! Here is his spec: AMD 4000 (Single) CPU, Asus A8NE-Sli Premium, 160gb Seagate IDE, 16x DVD, 2gig Memory (2 x 1 sticks) 500w Seasonic PSU. All brand new. Any help would be great. Ta.