[XA2] [5.0] Phone won't boot. Black screen

Hi!
I checked my phone which had a black screen with red led on for unknown reason…
I tried some combinations to try wake him up (vol up + power).
But at the end nothing. no led any more. No led light anymore when charging either…
That is very unconvenient…
Seems in coma.
Anyone has a trick?

I dont have a computer at hand this evening.
Phone is on the latest sailfish 5

phone has no chum or openrepos apps nor repositories.
Vanilla Sailfish, paid licence with app support. upgraded to 5 last week.

First charge it completely and then try again volume up and power on. Press long enough.
Good luck.