I just bought a monitor, a 24-inches AOC U2477PWQ, 4K resolution. I attached it to my 2012 MacBook Air running the latest version of Sierra, and macOS thinks it's a 30-inches AOC U2477WM, 1080p.
- The Display Preferences in macOS have more options than you might realize. One of them is a 20 inch Apple Cinema Display through a DVI / ADC convertor. Gorgeous, pin sharp resolution.
- Aug 02, 2016 In this article we’ll show you how to find the settings for custom resolutions in the Mac OS X settings, as well as some other little known facts relating to displays that you might find useful. New Resolution. Adding a new display to your Mac in Yosemite and above means you may have to edit the display resolution in the System Preferences.
Resolution Default For Display Incorrect Mac Os 8
Apple's Intel Mac Mini has only one display connection, the DVI interface. In case someone has chosen a wrong display resolution for a connected display, it is very difficult to switch back to a usable resolution.
When (for example) using a Benq LCD connected via a VGA to DVI adaptor to the Mac Mini and changing the frequency from 60Hz to 75Hz, the Mini will always remember the chosen resolution, even if a PRAM reset or complete hardware reset is done. So the screen still stays black, as 75Hz can't be shown although the Displays System Preferences pane offers this frequency. It doesn't matter if you are connecting another display to the interface and afterwards changing the resolution; the Mini keeps on switching back to the former one if the misbehaving display is re-connected.
In order to switch back to a usable resolution, you will have to remote control the Mini from another Mac using screen sharing, Apple Remote Desktop, VNC, or Timbuktu. Even though the Mini's screen will be black, the remote Mac will show a usable image. While remote-controlling the Mini, you have to change the resolution within the Displays System Preferences panel. After changing the resolution remotely, the display should jump back to a usable resolution.
[robg adds: Apple provides a potentially easier solution to the black screen problem: use safe boot mode. Thanks to queue user fds for pointing this out.]
When (for example) using a Benq LCD connected via a VGA to DVI adaptor to the Mac Mini and changing the frequency from 60Hz to 75Hz, the Mini will always remember the chosen resolution, even if a PRAM reset or complete hardware reset is done. So the screen still stays black, as 75Hz can't be shown although the Displays System Preferences pane offers this frequency. It doesn't matter if you are connecting another display to the interface and afterwards changing the resolution; the Mini keeps on switching back to the former one if the misbehaving display is re-connected.
In order to switch back to a usable resolution, you will have to remote control the Mini from another Mac using screen sharing, Apple Remote Desktop, VNC, or Timbuktu. Even though the Mini's screen will be black, the remote Mac will show a usable image. While remote-controlling the Mini, you have to change the resolution within the Displays System Preferences panel. After changing the resolution remotely, the display should jump back to a usable resolution.
[robg adds: Apple provides a potentially easier solution to the black screen problem: use safe boot mode. Thanks to queue user fds for pointing this out.]