Thanks for the link.

I remember activating during original install,so I'll follow the procedure listed for a hardware change once I get the new motherboard installed and Windows 10 up and running again on the new system.

Thanks again to everyone.

Also- just fyi for anyone later viewing the thread with similar issues- I did try the disconnecting everything but power and display, resetting cmos, rebooting and trying to pick up usb keyboard in Bios- no luck.

Take care,