Thanks for the reply.
BIOS was reset to default
This is a desktop.
I am now trying a PS2 to USB adapter. No luck.
When I plug the adapter into a USB port the LED on the adapter lights up indicating that there is power to the port. But when I plug in a keyboard the lights on the keyboard (Caps Lock etc) flash briefly and then nothing. Have tried several different keyboards.
Going to try starting the reinstall from the top with this adapter. Not feeling lucky, thinking that the USB ports are just not getting the right drivers