is iMac 2020 Glitching normal ?

For your information, during the first 14 days of purchase, you can return a device for a full refund if you purchased it directly from Apple. There is no "replacement" - it is simply a return. You can then decide if you want to buy another. You can, however, exchange it if the local store has the item you want in stock. Here is Apple's return policy including instructions on how to return an item:

https://www.apple.com/shop/help/returns_refund

Since we are not Apple employees, but just other end users, we do not know what Apple's policies or plans may be and are not allowed to speculate per the ToU here. So, unfortunately, we cannot say if a replacement would be functioning well or not.

Out of curiosity, you said it was a brand new machine, but your signature shows that you are running 10.13 - a brand new one would have come with 10.15. So, exactly what year/model is yours?

HI(Bonjour)!

As Apple investigate this problem, we cannot now say if it's software or hardware related.

In the first case, Apple's and AMD ingineers's may publish a software patch to resolve the issue. We don't know the timeframe for this solution.

If it' hardware one, may be we can be stock in a long wait to get a perfectly functioning replacement machine. Sometimes Apple responds rapidly, other times, an action Class lawsuit is required (As MacBook Pro 15" 2011 AMD defective graphic card).

So, If you need you machine to get work done and earn money, keep it and cross your fingers for the software side of the problem.

If you're not confortable, ask AppleCare for a return within 14 days.

As Yo6 wrote in https://discussions.apple.com/thread/251720089?page=2

"I received my brand new iMac Wednesday with the same configuration and I experimented exactly the same problem.

Today I called Apple Support.

The support told me:

• the problem is known internally by Apple. The internal issue had been released yesterday (afternoon, around 3:00pm)
• engineers are working on these random horizontal white lines / 5700 XT 16Gb
• we don't know if problem is related to hardware or software

I don't know what to do with my brand new iMac :

• Option 1 : return to Apple Store and ask for a new iMac with a cheaper graphic card (but working!)
• Option 2 : hope the problem is software and wait for next FIX.

If the problem is hardware I will own an iMac defect by design for many years..."

Michel B.

Hi(Bonjour)!

It seems that some iMac 5K 2020 with optional Radeon 5700 XT 16 Go present this problem:

https://discussions.apple.com/thread/251730390

https://discussions.apple.com/thread/251720089

https://forums.macrumors.com/threads/imac-2020-5700xt-graphical-glitch.2251034/

Michel B.

Here is a link to Apple's US warranty:

https://www.apple.com/legal/warranty/products/embedded-mac-warranty-us.html

If you do not want to return it, then the warranty terms will apply. Apple will only offer to replace a machine as a very last resort; there will be at least three repair attempts for the same problem/part. That means you need to send it in and they will try to repair and send it back. If they finally decide they cannot repair and offer a replacement, you will usually receive a refurbished device. You can contact Apple and ask if they will do what you expect.

It would be a better idea to return the machine, but it is your decision.

As for your signature, when you start a new post, you can choose your device underneath the post window and can "choose another device" or different OS.

Hi(bonjour)!

May be it’s related to third party RAM module. See this topic. Try your defective unit with original memory modules.

🥴By the way, my new iMac is now in delivery truck. I’ll post the comments about graphical glitch if there is one, later today.

Michel B.

Return it and get one with another Graphics Card. Only the 5700 card seems to be experiencing the problem, not the 5300 or the 5500.

Also only get 8 GB of RAM if you order another 27" 2020 IMac and upgrade the RAM yourself with modules from Crucial.com or MacSales.com at less than ⅓ the cost of what Apple would charge you.

Hi(bonjour)!

´hope your new one will be okay. Please, it will be interesting to post here the results with your new iMac.

My new iMac should arrive on sept 14th, shipped last thursday . I have not cancelled my order despite the problem and I’m interested by your experience.

Thank you!

Michel B.