Hi Barb,
May be you can give me some advise ..
I have the same issue like others with my Surface Pro 4 where suddenly my type cover not working when i turn on my surface. Already check a lot of forum, article, tube and go through this forum conversation and has tried: Power + volume up button, toggle type cover port on/off on bios, update the surface pro 4 tablet with latest update 21 September (if i'm not wrong), create recovery image and recover it from scratch and last i even buy a new type cover and its still not detected.
There are no light at all on both new and old type cover and on the device manager under Keyboard it only show HID Keyboard device and under Human Interface device there are no type cover device show on the list.
The rotation and touchscreen all beside the type cover is still good that's why at first i though it is only type cover(hardware failure) but when i buy a new one its the same. Unfortunately there are no Microsoft store in my country so i cannot ask them to check. Do you still have any advise what setting i can try..? beside buy a Bluetooth keyboard..
Note.
I'm using Windows 10 Pro Version 1703
OS Build : 1506.13
System UEFI : 107.1741.768
Thanks,
Yusman