Windows 10: Need help with Acer M1200 desktop. Won't start.

I am not sure if this is the right place for this so if it isn't would a mod please move it to the correct place?

I have an Acer Aspire M1200 (AMD Athlon LE1640) with Win 10 Pro. It sat unused for a couple of years until I dug it out this week to set up for my wife to do word processing on. When I plugged it in it fired up right away and ran nicely, taking a day to update Windows (it needed a lot of updates) after which I installed Libre Office and a few other things she needs. I was getting ready to make a few settings changes but had to stop for dinner and when I came back it was unresponsive. None of the usual keyboard shortcuts did anything and the screen was black.

After messing around with it for a few minutes and trying to shut it off with the power button (no response) I unplugged it (I know, not the best thing to do but I couldn't think of anything else). I let it sit for a while and tried plugging it back in and turning it on but it won't boot. When I plug it in the fans in the power supply and on the processor both start to run and the light on the DVDRW drive comes on but that is all. No hard drive, no power light, nothing.

I remembered that sometimes I had to play with the power button to get it to start when I last used it so I opened it up, unplugged the cable from the power button & indicators from the board and checked the button with an ohmmeter; It gives a solid zero ohms when the button is pressed so that isn't it.

I studied electronics 45 years ago so I understand troubleshooting and I'm not afraid to work on things but I haven't had a lot of experience inside computers so I would appreciate any help or suggestions.

:)

 

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Making backup and re-format...

Maybe I Install a Windows 7 again, At least, all of my games run smoothly ...Sadness!!

*Banghead