Galaxy A3 (2016) won't turn on

[marabcwhynot]

This happened some time ago and for some reason it just turned on but now it won't, i tried using a different charger and cable, i tried using my computer to turn it on but it doesn't work. I can't take out the battery because the back of my phone is not meant to come off, what should I do?
Sometimes it turns on to show it is charging but then it shuts again, i guess it just won't charge but why?
Holding the power button and volume buttons won't work either.

 

[rgd1101]

MERGED QUESTION
Question from marabcwhynot : "Galaxy A3 (2016) won't turn on"

This happened some time ago and for some reason it just turned on but now it won't, i tried using a different charger and cable, i tried using my computer to turn it on but it doesn't work. I can't take out the battery because the back of my phone is not meant to come off, what should I do?
Sometimes it turns on to show it is charging but then it shuts again