Turns on but won't start up

[benone]

I got my surface a hard restart because it was frozen.
Since then the monitor appears to be black all the time.
Keyboard is lighting up but the machine has no response.
Tried to connect to an external monitor via mini DP, nothing appears also.

Press and hold power + Vol up to reset, no hope.

 

[MickeyLittle]

Try letting the battery die. Do what you can to really drain it empty. Then with the power cord unplugged press and hold the power button for 15 seconds to discharge anything remaining. After that plug the power cord back in and wait 5-10 minutes and see if it will power up then.