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What's causing random restarts?

This started yesterday. I can leave the system on with nothing running and it restarts - or I'll be on the Internet or in anything and it just stops and reboots itself.

It started while I was at work. I ran AVG virus scan and it found nothing. I have logged in as administrator and scanned my disks and found nothing. If I stop at the OS selection screen or the DOS prompt, the machine stays on and does not restart. My system is a dual boot with Win98 and W2K. It does it with either OS - just restarts. I have a PC power and cooling 350ATX turbo-cool power supply Abit BE6-II, PIII 800, 768mb pc133, Maxtor 60gig, WD 18gig, SB live5.1, ATI Radon All in Wonder, TDK velocd, Creative 52x and 2 case fans.

I have tried another power supply. I removed and reseated all cards, CPU, and memory - I tried each memory stick one at a time. I replaced the PIII800 with my old PIII500. It still restarts randomly. Could it be the motherboard?

Please...any suggestions will be greatly appreciated.

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You've done all the right things in the right order, especially the memory because random restarts are a classic symptom of bad memory. It looks as if you'll need a new Mobo. Let me know if that solves the problem.

This was first published in November 2001

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