I have a pc for service with the GA-8I945PL-G mainboard. The system randomly shuts down and windows constantly comes up with blue screens indicating hardware issues. Ive already tried swaping out cpu and ram with no results. What stumps me is aside from the first few inital boots that gave me a 7F bios trouble code the system boots and randomly shuts down. After removing the cmos battery the trouble code went away. Please help