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Generally, I don't recommend using the AMD uninstaller with people that have AMD processors for this reason. It has removed your chipset drivers...which include the USB drivers. Install these :
AMD Chipset, AHCI, USB 3.0 and RAID Drivers
When the technician came, his usb-to-ps2 connector failed to activate the keyboard (whereas a pure ps2 keyboard had worked the day before).
I didn't know that two hard resets would force a Win10 safe mode/recovery screen.
For some reason this screen responded to the USB keyboard.
Our only option seemed to be reinstalling Windows - and the USB ports have all worked well since then.
If anyone is reading this with the same problem: try kingfish's recommendation if you have a ps2 peripheral that will get you around the UI. If not, then you will have to trigger a reinstall.
Thanks for the info.....