screen is black and unresponsive

i was playing on my Samsung Galaxy ace 3 when my screen froze and wouldn't do anything, so after several minutes i took the battery out. Now i cant get it to turn on! i have tried charging it and stuff but not even the charging symbol is coming up. i have also tried factory resets but nothing is coming up on the screen!

also me and my sister swooped battery's to see if that helped, her phone turned on but mine still didnt. So that means its not battery but my phone