Horizontal Lines on Screen of iMac, 24", 2021

For additional context, I have the following iMac:

iMac (24-inch, M1, 2021)

• Ports: Two Thunderbolt / USB 4 ports, Two USB 3 ports
• Chip: 8-core CPU (4 p-cores, 4 e-cores), 8-core GPU
• Storage: 1TB SSD storage
• Memory: 16GB unified memory

Ordered on: May 12, 2021

In terms of my exact symptoms, I don't think it's dead pixels. When I run a dead pixel test, I see two distinct issues:

• Along the bottom rows of pixels, there are three or four alternating black horizontal lines extending across the entire screen, just below the dock
• In the lower right section of the screen, from the base of the dock up to about 20% to 25% of the display, thicker light grey lines are visible, primarily on the right side. These lines add a textured appearance to the folders in the dock and are especially noticeable on an all-white background

Today got significantly worse, now it's alternating black lines almost up the whole bottom third of the screen!

Same here. I bought it in mid-2021 and just called Apple for help, but they gave me the same answer as in other posts. So frustrating… 650 USD?! bloody ****...

same issue here, iMac 24 inch 2021

Same issue with my iMac M1, after two years of usage. Horizontal lines mostly from top to bottom, and flickering screen. Sometimes the upper rim corner gets too hot to touch. I sent feedback already. I'll take my Mac to service as soon as I can.

iMac screen failure..

Horizontal lines at the bottom of iMac(M1… - Apple Community

Also...

Persistent horizontal lines appear on iMa… - Apple Community

I'm experiencing the exact same issue on my iMac, which I bought in 2021. The lines started appearing just a few days ago.

I am experiencing the exact same issue. Check out the bottom of my screen (image)

[Edited by Moderator]

****

same issue here, iMac 24 inch 2021..

Another one, M1 iMac 24 - 8GB - 256GB, purchased in June of 2022.

Exactly the same issue happened starting yesterday, been talking to Apple support and kept asked me to bring it over to Genius Bar

[Edited by Moderator]

That’s ether a bug or there are dead pixels

Unfortunately this is happening to my iMac as of this morning.

please explain with model you have and date of purchase.. we can make an idea in which Mac can happened this tragic bug... thanks any detail is useful to understand