MacBook Pro 2016 Display has faint horizontal line in 3/4 of screen I am suddenly starting to see this faint horizontal line in 3/4 of the screen and the Dock area, especially on dark colors and blue. They don't appear when I connect to an external port via a thunder bolt.



It's just over a year old :( What could be causing this?
Sounds like a hardware failure, you should go and visit an appleStore or a apple reseller to get this problem fixed.

I had the same Problem, so I went to the appleStore in Oberhausen (Germany). they repaired the Display for free.