Would you believe it. After three years my 'dead' Lenovo Thinkcentre m70e desktop PC is still good. All I did was to just plug in a spare over-sized power supply unit (PSU), power it up and it just came back on - right into the screen complaining about no boot media. To get rid of this error screen, I then plugged in its hard disk (which I have removed for other uses) and Windows 7 just booted up like nothing has happened since July 2020.
I can't believe it. I almost trashed a good working computer.
