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Originally Posted by homealone
do any of the items in the 'device manager' display yellow question marks next to them?
[[ No, all are normal]]
is it possible he may have inadvertently gone into the bios settings? I seem to remember that you can set the bios to always repeat the last behavior of the 'power on' button?
[[With dad's shaky hand ANYTHING is possible but I have always told him to call me if he gets any screens asking lots of questions about how the machine operates]]
Otherwise, the trick with an ATX power supply is to hold the button in for about 5 seconds, when it doesn't seem to want to go 'off'. It should then work properly. 
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[Well, that sort of works. I select shut down from the menu and then after about 20 secs the monitor screen black for a moment - then shows the message "it is now safe to turn off the computer". Problem is the computer lights and fan are still ON. YES, holding the off button for 5 secs DOES cause a switch-off 'somewhere' because I can hear the click from inside the case. However, as soon as I release the button the machine starts up again. To get a complete switch off I need to throw the mains power switch on the wall - and I do not like to have to do that.