Galaxy A3 won't switch on

[AC Question]

Was listening to music on my phone earlier and it switched off, tried charging it and pressing the volume, power and home button simultaneously but no response

 

[Spagman72]

When a phone shuts down during normal operation it's always a hardware failure.

You can try a new battery first.
If that's not the issue the next common problems are a dead emmc memory chip or the power IC.