macbook pro only works with bluetooth keyboard and mouse
I have a MacBook Pro, early 2015 vintage running MacOS Sierra 10.12.05 and until this week I have had no problems then a few days ago the mouse froze during a session and and upon restart the keyboard and mouse have stopped working and the OS is looking for an external Blue Tooth Keyboard and mouse, which I can then connect with. Fortunately I have a Mini Mac and can borrow or use the KB and mouse from it but that is not a long term fix.
How can I get the laptop Keyboard and mouse to reconnect with the OS and the laptop?
MacBook Pro, OS X Mountain Lion (10.8.4)