Hi Doug,
Based on the information you've provided, looks like the power supply on your PC has been affected by the power surged that you've recently experienced. The power that your PC supplies to the USB ports are not enough to sustain it.
By the way, have you tried connecting your keyboard to a different USB port on your PC? Did you experience the same issue? If you have, then I suggest that you get in touch with your computer manufacturer so they can look into your PC's power supply. Please have the BIOS check as well and make sure the settings are back to default and that the USB ports are activated.
Looking forward to your reply.
Regards.