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Issue:
PC reboot itself automatically every hour (60 minutes).

Software?
The option to automatically restart on system failure has been turned off.
There is no scheduled task or cron job running hourly, no any sign indicates a virus or malware infection.
It happens even in newly installed OS, regardless of what operating system is running, Windows (XP/Vista/7/8/10) or Linux (Ubuntu/Debian/CentOS/RedHat/Fedora/SuSE).

Hardware?
Motherboard, CPU, RAM, hard drive, power supply, cables, fans, keyboard, mouse, screws… Everything seems to work properly except it just black off every time when it is the plot twist of your favorite TV series, how cruel…
No faulty hardware, no overheating, no power failure. No, the reset button is fine, don’t bother it.

Solution:
Some say it was a bad capacitor on motherboard causing the issue, some say it was the battery. I get rid of my PC hourly restart problem by simply update the system BIOS. If you are about to despair, try it 🙂