Rare case of a black vertical line on my screen

[Jackkkkk]

Hi guys,

My MacBook Pro (mid 2017 version) sometimes shows a black vertical line at start-up (it shows up at my login screen). This black vertical line occurs when my MacBook is 'cold' at start-up. After logging in, the black line immediately disappears. Only in one case, it stuck around for like 5 mins after login.

So when my MacBook is booted for the first time of the day, it may be highly likely that that black vertical line shows up as described. After the first boot, it never comes back. Unless I shut down my MacBook and leave it like that for a couple of hours and boot it again.

I did a clean install, did everything I was told to by the Apple Online Chat. Unfortunately, that same line keeps appearing at boot-up as described. I got the advice to book an appointment with a Genius Bar for repair as the guy that helped me out, concluded my issue as a possible hardware malfunction.

However, I'm wondering what the exact issue behind this error may be. I've searched on the internet for similar issues but could never find any. Most people with GPU issues, if it is a GPU issue at all, have way different lines than I do and most of these errors were with older models. My MacBook Pro is a brand-new 2017-model (bought it late October 2017).

I've added a photo of the issue.

Thanks in advance!

 

[Fishrrman]

Since you have the pic as "evidence", take it back to a brick-n-mortar Apple Store and show them.
See what they say...

 

[Jackkkkk]

Since you have the pic as "evidence", take it back to a brick-n-mortar Apple Store and show them.
See what they say...

I did took my Mac to the store I got it from. Kept my Mac ‘cold’, as in no earlier start-ups done that day just to show that line. And it did pop up again and they also saw it disappear after logging in. They were very amazed as they never witnessed a 2017 Mac Pro with this issue. Therefore I booked an appointment with the official Apple Store. I wonder what the issue is.