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Re: Dead computer after system shutdown. - Resolved for Now

Box is between two tables but managed to remove side cover and with mirror confirmed green light on motherboard. Unplugged power cord, green light goes out, reconnected power, green light on and power switch works, BIOS message Asus surge protection shut system down because of unstable power supply..

My records show I assembled this box from components in 2008. Should I be worried? Expected lifetimes of cpu, mb, power supply?

On 05/06/2018 12:14 PM, Thomas George wrote:
Selected shutdown from the window manager and the operating system turned off the computer as usual. Tried to restart the computer from the switch on the desktop box but it was totally dead.

Where to look for the failure? CPU, motherboard, power supply or mechanical switch?

I never thought before about how the operating system shuts down the computer. I know there are two wires from the power supply which the desktop switch connects to turn on the power supply. How does the operating system turn it off?