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Re: Dead computer after system shutdown.




Thomas George composed on 2018-05-06 12:14 (UTC-0400):

> 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?

If it was made between 2001 and 2004, good chance it's failed motherboard
capacitors. Otherwise, most likely candidate is PS failure, typically also from
failed caps. Overheating from dust accumulation can kill other components, CPU
in particular. Sometimes it can be the switch, and quickly repeated attempts or
stronger presses will eventually start it.

What brand and model PC or motherboard?

Cap replacement can often fix, but isn't necessarily worth the trouble and
expense unless you want to do the repair yourself. See http:://www.badcaps.net/

> 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?
> 
Software call to BIOS.
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