Hello, Mark Meyer1.
Welcome to Microsoft Community!
After reading your description, I understand that you are currently unable to enter anything into this Surface device and therefore you are unable to access the system.
At this point, in order to help you regain the operating conditions of the device and try to fix the fault, what we can do is to perform a recovery installation of the device using a USB recovery drive.
You can get the recovery image of your Surface device from the following site:
Surface Recovery Image Download - Microsoft Support
After completing the creation of the recovery media, please continue to refer to the guidelines in the following link to complete the recovery of this Surface:
Creating and using a USB recovery drive for Surface - Microsoft Support
Finally, I would like to confirm with you here the exact model number of your Surface. If this is a continued model, perhaps we may still be able to access the help of the Surface Technical Support team.
I am always here to support you.
Best Regards.
Leo.L - Microsoft Community Support Specialist