Ok so I got into work today and an employee was having issues with their PC. It's a Compaq built machine with Windows XP. The machine boots up into the loading screen, says it's loading and then restarts and gives me the option to go into safemode and all that because the machine was not properly shut down. I've been researching the problem for a few hours now, and the employee had said "the computer was acting up lately" but couldn't give me any information past that. So far I have replaced the power supply, checked the fans, checked the RAM, checked the IDE cable to the HardDrive, and made sure nothing is overheating. In short Im at a loss here and I can't seem to figure it out. He needs the PC back ASAP and I'm running low on time now. Any ideas or suggestions?