Old Pc Randomly Reboot - Turning Off Video


The system is a pentium iii 900mhz, with an asus motherboard. It has been running fine for many years now without any issues. The only thing that was done to it over the years was a memory upgrade, and there were no issues for over a year after that. All of a sudden when using it, the monitor would shutoff or it would reboot sometimes going into the bios screens. This happens very randomly. They are using windows xp, and to eliminate any software problems, i completely reinstalled the system, installing all the latest patches, anti-virus, spybot, etc. It is now a completely clean system. I ran prime95 to stress-test the memory/cpu, and it ran for 8 hours with no problems. I replaced the video card, checked the voltage of the psu with a multimeter, everything looks good. Of course it works perfectly when i'm there, but the moment i leave it acts up. It must be the psu dying slowly possibly working fine most of the time then a drop in power at random intervals. With my experience of dying psus, usually they die completely, as in you can't restart the computer, i have had 2 do this over the last 15 years. Or possibly something wrong with the motherboard? Is it possible the battery on the motherboard needs replacing? Does anyone have any suggestions other than replacing the psu or motherboard?

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