Agreed, I was just 'shooting from the hip' with the keyboard;
in fact the new keyboard just arrived and I tested it on the 780
but of course it didn't work. However I'm not out anything as
it's always nice to have a backup keyboard.

However, since it's on both computers I'm trying to think of
anything I've added to the 780 since I use it very little. I've
done updates for FF, Macrium, and the VLC player, and of course
Spywareblaster, Malwarebytes, SuperAntiSpyware and Avast.

Oh, I installed Sea Monkey !! that's new to both computers.
Could that be doing this? That's the only new program I've added
and it fits when the backspace key went out.

I opened the HD-Tune and checked the Health tab on the 8500
but all I could find was 'Reallocated Sector Count' but the data
column is zero.

https://postimg.cc/yDdpV31Y

However, when I checked the 780 Health tab there was nothing. I
thought maybe if I ran a scan it would show up although I didn't
have to do this on the 8500. I included the rest of the tabs.

https://postimg.cc/rRDbfdDp

https://postimg.cc/bZx5Vfw1

https://postimg.cc/bd4FzwGQ

https://postimg.cc/1f67416b


Robert