Why is my Lumia 630 NOT turning on or even vibrate

[Windows Central Question]

I was trying to open whatsapp and it couldnt open then i kept on trying on the 6th attempt it the screen went black. I tried soft, hard reset and yes the battery was full when this happened.
Also when i connect it to my laptop it wont be recognized and there is no change.
please help

 

[Guytronic]

Defective battery perhaps?

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