My MacBook Pro touch bar 13" isn't starting
I used to have the same problem with my MBP. Just brought it to the appleStore in Oberhausen(Germany) it was a hardware trouble which could be fixed within 2 hours.  

I didn’t need to pay for that. So if you want to get a quick solution you should go to the appleStore or a reseller.  It could be a bad cable, bad power adapter or something internal needing replacement or reseating a cable.

Hope that this helped you.