Why does my S8 turn off once plugged in?

The S8 was dead when i tried to power it on, so i put it on the charger and nothing happened!

I also changed the battery on it and still nothing happened! After all that i tried charging the phone wirelessly , still no success… I took the Battery out and charged it externally and the phone finally powered on!

The first thing i wanted to do was backup my data but when i plugged in the device it just went black (died)! It seems like the phone is just shorting out, but as far as i know the phone has not been dropped and it as never had water damage either!

I smart-switched everything to another device but i dont think that resetting the device is the Answer! Does anybody know what could cause the problem? and maybe give me a hint of 1 or 2 things i should look at first to get this issue resolved?

Thanks!