Tech help

What's the specific model of the Surface you have? I've googled a little bit, but different models may have different methods of resetting.

Keep in mind, you will probably end up losing everything and need to do a hard reset. I think.

Not sure if this method will work for you but its pulled from https://www.microsoft.com/surface/en-us/support/performance-and-maintenance/troubleshoot-updates?os=windows-10&=undefined#RestartW10


Solution 3: Two-button shutdown and restart (Surface Pro models and Surface Book only)
Important
Don't use a two-button shutdown on Surface RT, Surface 2, or Surface 3.
Step 1: Go to Start Windows logo, and select Power > Shut down.
If you can’t shut down your Surface normally, press and hold the power button for 30 seconds.
Step 2:

After your Surface turns off, press and hold the volume-up button and the power button at the same time for at least 15 seconds and then release both.
The screen may flash the Surface logo, but continue holding the buttons down for at least 15 seconds.
Step 3: After you release the buttons, wait 10 seconds.
Step 4: Press and release the power button again to turn your Surface back on.