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User profile for user: kbourg
kbourg Author
User level: Level 1
4 points

iMac display distorted

I upgraded my system software to V 10.13.6 a couple of weeks ago. Today my display is distorted and stretched very horizontally. I attached an image. I've tried restarting in safe mode, unplugging everything and plugging it back in, disconnecting my second monitor and changing the display setting in my preferences. If I take a screen grab of the display and someone else opens the image on their machine, it looks normal and not stretched. I ran an EtreCheck report, but can't paste it in here because it uses too many characters. Any suggestions?


iMac (Retina 5K, 27-inch, 2017)

Processor 3.8 GHz Intel Core i5

Memory 64 GB 2400 MHz DDR4

Graphics Radeon Pro 580 8192 MB

iMac 27" 5K, macOS 10.13

Posted on Feb 28, 2019 8:04 AM

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3 replies
User profile for user: ProbsRus
ProbsRus
User level: Level 4
1,126 points

Feb 28, 2019 1:58 PM in response to kbourg

In order to post your Etrecheck report you'll need to click on the icon (seen highlighted in my screenshot) and paste it there. The Etrecheck report may provide some clues that will others to provide additional suggestions.



There are multiple key combinations for getting into the macOS Recovery mode. Some use a special recovery partition on your hard drive, while others boot from the internet. It sounds like you received an error when trying to boot into macOS Recovery mode which may be a clue, I just don't know what it would mean. Can you try all three methods of getting into macOS Recovery and see if any of them are successful, and whether any of them resolve (even temporarily) the display issue?


Command (⌘)-R

Option-⌘-R

Shift-Option-⌘-R


This Apple document provides additional info about the various macOS Recovery modes.


How to reinstall macOS from macOS Recovery - Apple Support


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User profile for user: ProbsRus
ProbsRus
User level: Level 4
1,126 points

Feb 28, 2019 9:41 AM in response to kbourg

I suggest resetting your NVRAM since it contains some of the display settings. Restoring to defaults may help.


Reset NVRAM or PRAM on your Mac - Apple Support


Since the issue occurred after an OS upgrade I also suggest booting into macOS Recovery mode to see if the display still appears distorted. If not, then it may indicate an OS issue that warrants a reinstallation from macOS Recovery. Make sure you have a backup of your data.


About macOS Recovery - Apple Support

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iMac display distorted

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