Did you try the force reboot option? Hold the Power button + Volume UP button and wait until it reboots. Let go of both keys and see if your surface works better.
Another question: when Booting, do you see the Surface logo?
Hold the Power Button down for 20 to 30 Seconds, then Hold Volume Rocker Up and press the Power Button, this will boot into UEFI, exit without changing anything. This acts as a soft reset.
that happened to me once...screen blacked out but still seemed it was on due to vibrating windows button..after continued power button pressing after several minutes rebooted eventually