It must have been the prolonged heat. My main laptop computer decided just yesterday that it didn't want to Log On any longer. While I am a fair hand at computer repair, and can (given time) untangle most software knots, I do need something to work with. And finally after attempting a few software resets, I did get a message out of it, "computer needs repairs." Great.....
One of the nicer things about laptops is that they are pretty easy to diagnose. There are really only 5 main things that can go wrong. And I at least managed to eliminate 2 of them.
It is not physical. Both Keyboard and Screen appear fine.
It is not power. I can get it to power up, just not bring up an operating system.
So that leaves:
The motherboard. An easy / expensive fix. Go get new computer.
RAM. It can occasionally go bad. Fortunately it is both cheap and easy to replace. I might even be able to load a bit more power under the hood. The only issue - did it corrupt anything else or attempting the software corrections result in needing to reinstall all the programs on the hard drive.
The Hard Drive. It seems unlikely as I did get a response when attempting to reinstall from the backup. But the start sectors could have gone bad. Again an easy fix but mildly expensive. I would likely replace it with a SSD. I don't particularly like Western Digital, but they do offer a 1T drive for about $150.
Needless to say, I may be out of touch for a little, or slower to respond as I will be working off my backup / traveling machine. Fortunately only programs are at risk as I have my data nice and safe on a series of external drives.