Aman_0 wrote:
My original Mac Book Pro 14 inch (2021) model running on the updated version: macOS Sequoia 15.3.1 (24D70) experienced a sudden and concerning display issue. While switching from coding to the Calculator app, horizontal lines appeared on the screen (as shown in the image). I couldn't resolve the problem and had to force a restart using the Touch ID button. Following the restart, I noticed flickering in the top right corner of the lock screen. After a subsequent shutdown and restart, the issue hasn't returned.
I'm trying to understand what might have caused this temporary display malfunction.
Date of Occurrence: March 8, 2025.
https://discussions.apple.com/content/attachment/86bae936-fa02-41de-9896-2c3701330e7f
You have a hardware failure.
I might suspect the horizontal lines you see point to GPU /screen buffer /display-generator fault.
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 Support - Apple Support
*I would let Apple tell you what is the issue— get a service record started for your machine to document the issue, even though it sorted itself for now.
Get your mac repaired and how much will it cost
Mac Repair and Service - Apple Support
Get your Mac ready for service - Apple Support Get your Mac ready for service - Apple Support
Check Device Coverage
Check Your Service and Support Coverage - Apple Support
