New Display stays black

My fairphone 4 just got the ghost touch and some other display mal function. Therefore i decided to change the the Display. the installation was easy but the phone would not start after pressing the power button. It just stays black and once a minute i hear the phone vibrate.
Did someone experience the same issue?

Welcome to the Community Forum.

You might want to check if your connector has gotten bent when you pressed it into place – like in this topic: