When we install the computers, we disable the windows home button because it sometimes can be pressed while it’s in the enclosure. As you can tell, this can be extremely annoying to have the tile screen appear in the middle of a photo session!
This also unfortunately disables the volume and power button when the Surface is on. This means that you can still turn the computer on via the power button when it’s off. Now, this doesn’t seem like a big of a deal, BUT if the computer for whatever reason falls to sleep INSTEAD of turn off, then it will become increasingly difficult to turn on the Surface.
SOLUTION
The only way around this is to either...
1) Hold the power button for 15 seconds to power it off completely and then press it once more to turn it on
2) Unplug then replug in the power plug to the Surface.
3) You can also try re-enabling the Surface home button.