iMac 27 inch 2020 - Screen Glitch (Random Lines Appear on Screen)

Hi guys, I noticed the same lines glitch last night while watching Apple TV. I've had my 2019 Imac , 3.7 Ghz i5 , 8GB RAM , Radeon Pro 580X 8GB for two months now and this is the first time I've experienced this.

I updated macOS Catalina 10.15.6 about a week ago.

Today while watching YouTube the glitch started again.

Need some advice please on what to do next.

Thanks

Does anyone NOT have this issue? I was about to buy that configuration with that video card but am holding off to see if it’s hardware or software. Sad to hear this. Was so looking forward to finally owning a Mac.

Oh good I'm not alone - I'm having the exact same issue on my 2020 iMac with the Radeon Pro 5700 XT 16 GB. Hopefully it's just a driver issue. For me it's really not all that frequent or annoying but I do notice it when it happens.

Hey folks,

got the same issue as mentioned by the OP. White horizontal white line flickering / flashing. First time I've seen it was right during setting up, however, thought my eyes were just playing tricks on me. After that I noticed it on the desktop without running anything besides finder of course.

While using Adobe Bridge it happened more frequently (skipping through fullscreen previews of RAWs). Resetting the NVRAM didn't help nor made pushing the iMac to its limits the glitch / issue worse. It just happens now and then. My OCD says I should request for a replacement ASAP especially considering the price tag ;D

iMac 20,2 27" 3,8 Ghz 8 Core i7 + 5700 XT.

@Bunn_pt, I just got off the phone with Apple CS. They were transferring me around and I had to explain my situation 4x all over again, just to be told I have to arrange a return. Have to send it back for a replacement. Not sure what good is it for, if there's no guarantee the replacement wouldn't have the same problem.

uff this is unsatisfying - not quite the answer all those experiencing the issue are looking for. Apple should really look into the matter, open files of users describing the problem and do trouble shooting on their end. Considering the vast amount of people complaining this "glitch" will not go away after getting a replacement anytime soon.

Hopefully blogs like 9to5mac keep on posting news about this, so some people at Apple finally acknowledge the issue.

Apple admitting even semi-pubicly (that is, over the phone with AppleCare) that they have a hardware issue usually takes months if not longer compared with when they identify the issue and apply a fix at the factory. So maybe there's a chance units rolling off the assembly lines already have a fix.... I hope.

Could people who have posted (and will post) with this issue please say, as Mr. Bienick did, how much graphics memory they ordered with the their 5700XT? Thanks.

Same here. I cancelled my order before it was too late. I called apple customer services today explaining why I cancelled and my concerns, apparently they have no knowledge of this issue. I told them that plenty of people are having these issue and I won't be buying until I know it is sorted out.

Exactly the same. Hard reboots and graphics artefacts. Was after playing city skylines. We tried apple support but would have been stuck with out devices for up to 4 weeks. So we returned it to place of purchase.

Same here- Civilization VI is crashing consistently on my new iMac. The crashes are quite spectacular, making the screen look like its shattered & requiring a hard reboot.

iMac: 27-inch 2020

・10-core Core i9

・32GB RAM

・Radeon Pro 5700 XT 16GB

There is a big discussion on this glitch problem at the macrumors imac forum. Search for the discussion thread, "iMac 2020, 5700XT - graphical glitch?" Right now, that thread is pinned to the top of the MacRumors iMac forum.

They have poll where, so far, 24 people out of 37 users of the 5700XT model, i.e. 65% of people are experiencing this problem. Note that this problem, according to the poll, only affects users who have the 5700 XT graphics card. The link to that thread is here:

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

Me too! I also cancelled my order before it went to shipping status. I concluded that the issue is too wide spread and being experienced by lots of new iMac 2020 5700XT users. I called Apple and couldn’t believe they haven’t heard about the issue and told them why I cancelled the order and that many other customers are doing the same until it gets sorted.

I didn’t see it at all yesterday and I don’t see large lines like the screenshot somebody posted. Mine was a small line that flickered randomly on the screen when I first set the computer up and it was being restarted.

Be careful of interpreting statistics of such small numbers. It could be, as the raw numbers suggest, that 2/3 of iMac 2020. 5700 XT's suffer from this problem.... or it could be that only 37 out of hundreds of owners could be arsed to respond, because the rest don't have a problem. Self-selection is usually a red flag in validating statistics.