i have a computer that has both windows xp and 2000 installed.
either during loading OS or either during usage of either OS, computer gets automatically rebooted,
without any blue screen and without safe mode options shown after reboot.
i loaded safe defaults in bios, but didn't help.
first reboots were rare, but have become more common.
i assume pc would not reboot in if i left it alone, but reboots after i start clicking around, starting programs
i would assume culprit could be: power supply or motherboard or cpu.
which of these is more probable ?