Ok, i took my watercooling CPU cooler of the CPU to change it with a Arctic Alpine 64 heatsink, once i put the motherboard back in the case and start the sytem up nothing comes on the screen and the num lock, scroll lock and caps lock buttons all stay on for about 15 seconds untill the pc turns itself off.
All thats pluged in is the two power cords to the mobo, one stick of RAM and the CPU fan on the heatsink.
CPU: AMD Athlon X2 3800+
PSU: Hiper Type-R SLi 580W
Any help would be greatly appreciated. Thanks