I am working on a system, AMD Duron 800 mhz. 40 gig hard drive 256 ram. It just randomly shuts down. I thought it may be a temp problem, but isn't, temps are in good range, and stable, could this be a mobo problem?? the motherboard pretty new, 4-5 months. I tried the ram in my computer and no probs, so i know it isn't the ram. It will shut down, then won't come back on, till i reset the psu.