Grey horizontal borders show up

"Thank you for dealing with this! > A. Single-Out this Screen: > B. Single-Out this User: I didn't get both error so found out that this's a hardware issue and a misconfiguration within my macOS. If possible, could you tell me how to solve its misconfiguration?"

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You are welcome.

Change the Resolution:

Perhaps you intermittently changed the screen's resolution? So, try other resolutions, seeing if you get this issue. If that does not work, then it is time to get this serviced: Change your Mac Display’s Resolution - Apple Support

Getting this Serviced:

A. Your Screen is Failing:

I have come across this on my 2017 Mac. The connector between the LogicBoard and the screen was loose, and I had to send it in for service 11 times. Being during COVID, I had to send this in. Today, the option to take this in for service is an option. So take this in for service, ASAP.

B. So, Get this Mac Serviced...

Contact Apple, and setup a Genius Bar Appointment or see an AASP (Apple Authorized Service Provider) in your local area.

A. Contact Apple:

• Contact Us - Choose Locations
• Proceed from there as Necessary
• NOTE: Due to the Coronavirus Pandemic, calls are taking a bit linger to get through. And, that makes sense, because many are at home working out-of-the-house or are taking classes over-the-web, this they have more time on their hands to contact Apple Support. So, it might take a bit to get through to Apple Support. But, just stay on the line, and someone will be with you.

Or...

B. Contact an AASP: 

1. Go Here: Find Locations - Apple Authorized Reseller
2. Click: Service & Support
3. Enter: your location information
4. See: if there is an AASP nearby
5. Contact: an AASP that shows up, and find out more about the services that they offer to fix the Mac

KentaTominaga_jpn Said:

"Grey horizontal borders show up: Hi, my Macbook Pro suddenly show grey horizontal borders. It happens almost any time. Few disappear. Idk the difference between they come up or don't. I tried to reset NVRAM（PRAM）also SMC. Even tried turning up as safe boot, which failed to solve this problem. My Macbook Pro is. 13-inch, 2017, Two Thunderbolt 3 ports 2.3 GHz Dual-Core Intel Core i5"

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Thank you for the photo.

Troubleshooting a Mac with Vertical Lines:

A. Single-Out this Screen:

Connect to our Mac to an external monitor, and then see if you still get this error. If so, then it is a software issue. If not, then it is a hardware issue.

B. Single-Out this User:

Create a new Administrator Account and then log into it. If you get the error, then if an issue with the entire macOS. If not, then it is a misconfiguration within your entire macOS.

KentaTominaga_jpn wrote:

Hi, my Macbook Pro suddenly show grey horizontal borders.

It happens almost any time. Few disappear. Idk the difference between they come up or don't.

I tried to reset NVRAM（PRAM）also SMC. • Even tried turning up as safe boot, which failed to solve this problem.

My Macbook Pro is.

13-inch, 2017, Two Thunderbolt 3 ports

• 2.3 GHz Dual-Core Intel Core i5

https://discussions.apple.com/content/attachment/b96a0be5-87b7-4bf4-b238-3dae2dee8658

I do not see it in your screen shot...do you?

Screen shots come direct from the GPU.

Horizontal lines would point to GPU /screen buffer /display-generator failing.

If you display is showing faults— take it in let Apple tell you what is wrong.

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"

Genius Bar Reservation and Apple Support Options - Apple

Outside the USA

Contact Apple for support and service - Apple Support

Get your mac repaired and how much will it cost

Mac Repair & Service - Apple Support

Get your Mac ready for service - Apple Support Get your Mac ready for service - Apple Support

Check your warranty coverage

My Support - Official Apple Support

KentaTominaga_jpn Said:

"Grey horizontal borders show up: Thank you for teaching me in detail! After seeing your suggestion I decide to go to AASP near me today to check what's wrong in my laptop. Thank you so much again!"

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You are welcome.

What's the word from the AASP, as to the reason for this?