After assembling all of the components and switching on the computer the power stays on for a second or two and then switches off. It only does it if there is any ram installed. If I take the ram out the power will stay on and report a memory error. The system consists of a MSI P6N SLI Platinum motherboard, a E6750 CPU, EVGA 8800 GTS 640MB, and 4Gb G.Skill ram. Any help would be greatly appreciated.