Apparently this issue occurs with the Surface Pro 3, 4, etc as well. I was using my type cover earlier tonight to get some stuff done online when suddenly the lights on the keyboard cut off. I tried disconnecting/reconnecting the keyboard and STILL nothing. Ok, fine, I reboot the computer....computer starts running slower than usual so I enter tablet mode and immediately scan for infections with Malwarebytes, etc. Nothing found, but the scan was slower than usual. I shut the computer down, turn it back on. Keyboard STILL doesn't light up. I plug the keyboard into my old Surface 3 and immediately it lights up.….wtf..... Do some searching on "the google" and find that every once in a while this happens and you have to just shut the computer down completely, then hold volume up and power for like 10 seconds until you see the windows logo. The bios screen comes up. At this screen, if you try to move the mouse or press the up/down arrow keys on the keyboard, you will notice that it works again AND they keyboard is now lit up. Wow, what a scare....at least I know what to do next time I witness this issue! Thankfully it was not a virus! I didn't see this tip anywhere here in Surface Forums, so I figured I would post about it. Hope this helps more members that may experience this issue.