iMac 24 M1 Display issue

You're experiencing what many other M1 iMac owners are experiencing: the following topics illustrate the Silicon M1 iMac Display problem:

Screen Failure on 24-inch-iMac, M1, 2021 - Apple Community

Persistent horizontal lines appear on iMac Screen - Apple Community

Horizontal Lines on Screen of iMac, 24", 2021

Horizontal black lines covering bottom 3rd of 2021 M1 iMac screen

Grey horizontal patches on my M1 iMac 2021 model

Horizontal lines at the bottom of iMac(M1,2021) screen

Horizontal Lines on 2001 M1 iMac Display

M1 iMac Display vertex heating to scorching 55°C  — Seeking Advice on Escalation

Horizontal Lines on iMAC with M1 chip

Others have reported that the repairs will cost about $600 US.  That's about ⅔'s of a new Mac Mini M4.  

Amoung the options you have are these 4 to consider:

#1 - pay the ~$600 US price for  Apple or an Apple Authorized Service Provider to repair the monitor (which is over ½ of a new M4 Mac Mini).

#2 - get a monitor and use it with your M1 iMac.  You can get a 27" or 32" monitor from $140 US on up. 

#3 - get a new Mac.  If considering this option consider the following: a 12‑core CPU, 12‑core GPU Dual 16‑core Neural Engine Mac Mini M6 with 16 GB RAM and 1 TB SSD ($1399 US) with a 32" LG 4k monitor ($331 US) from Amazon.com)  is $1716 which is $450 less than a similarly configured new 24" M4 iMac ($2199 US). Keep your keyboard and mouse from your current Mac for use with the Mini. 

#4 - keep tabs on the Apple Service (Recall) Programs - Apple Support in hopes that a recall/repair program is activated.

Just some food for thought.

Zen2022 wrote:

Present Situation: The internal display is now completely unusable. I have turned the internal screen brightness down to zero to prevent further heat buildup and am now running the M1 iMac strictly as a desktop connected to an external LG 4K display.

That is a good temporary fix.

Now is a good time, to start looking for an M4 Mac mini or order a new M5/6 Mac mini to replace the 2021 iMac.

Consumer products, their warranties, and their extended warranties work in a predictable way.

Warrant-able implies, but does not guarantee, High Quality:

Consumer product makers build high quality products. You can tell because the manufacturer is willing to stand by their products and repair or replace them (but only for defects in materials or workmanship) at manufacturers expense for a stated warranty period.

For Apple Macs in most countries, that period is one year. That is the total responsibility Apple or any manufacturer has to you under law. Assumptions about additional responsibility of Apple or any other consumer product-maker's products working longer or maintaining their original failure-free status longer than the warranty period are not accurate. The amount you paid for the product has no bearing on this. The rules are the same for a car costing US$20,000 or more.

Complex Electro-mechanical devices fail at random, arbitrary, and capricious times.

The most frequent reason for most failures is 'just because'.

Your specific failure is most likely caused by an advanced scientific principle called ...

... 'bad luck'.

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If you want a really substantial lesson how this this works (or more precisely how this stops working) own an older used automobile.

I am certainly not asking out of ignorance. I already use an external 4K monitor as a workaround, so the M1 chip itself is fine. The point of my post is not to seek basic buying advice, but to highlight a ₹60,000 screen defect on a 4-year-old machine and hold Apple accountable for a widespread hardware failure. Dismissing a major product flaw by telling users to simply buy a new Mac ignores the underlying issue.