Question instant reboot problem

Dec 29, 2020
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Sir, I have ecs g31t m7 ver 7 motherboard, an e5700 , and two 1gb rams.
It boots and works fine in every three hours, when i switch it off it works again after three hours.
On instant rebooting it will give no display, and fan will be running, num lock not working .
I am using 20-pin power supply .