Earlier this month, Apple introduced an updated all-in-one iMac, which, among other things, received a Radeon Pro 5500 XT, Pro 5700 or Pro 5700 XT graphics card. It looks like some users may have problems with the older one.
Several users on the Apple forum complained that stripes appear periodically on their screen, and their appearance has nothing to do with the load on the PC or any specific work scenarios. At the same time, such iMac tests pass without problems.
It is not yet clear how widespread the problem is and what kind of problem it is, since it can be both software and hardware. In the first case, Apple can fix everything with a software update, but in the second case, users will have to contact service centers.