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I accidentally set the resolution to an external monitor to one that it's not capable of displaying. Now I'm unable to change it back and can only view an external monitor while the macbook is open. I've tried resetting NVRAM already with no effect.
How can I reset the resolution on this display while the macbook is closed?
For anyone else who runs into this issue, I had to install TeamViewer, remote into my machine, change the resolution on the external monitor, close the lid, then change the resolution back to the default for it to stay up.
For anyone else who runs into this issue, I had to install TeamViewer, remote into my machine, change the resolution on the external monitor, close the lid, then change the resolution back to the default for it to stay up.
With clamshell Open, open Displays Preferences. Use the (Gather Windows) button to move the multiple display settings panes onto the current display. That will allow you to see and change the settings for any connected display using only the main display to do so. Described in this article under "Gather Windows" heading:
Change Display preferences on Mac - Apple Support
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There is only one stored resolution for the display, and that resolution is Not used in safe mode.
The only other way I know of to influence the resolution is to check/uncheck 'Mirror Displays' here:
.
But you could also try Safe Mode. Safe Mode loads very few extensions, and takes defaults for everything it can, including display resolution. Changes to display resolution you make in Safe mode will "stick" in regular mode.
There should be no difference between the resolutions on the External display when the main display is active or inactive, unless you have mirrored the displays. There is only ONE setting per display for display resolution.
If the display does not light up, you may need to debug a BROKEN display setup, rather than just extreme resolution issues.
Safe mode also didn't work. For what it's worth, the monitor worked fine at 1080p resolution, then changing it to 1080i makes it no longer displayed when the clamshell is closed. The monitor shows 1080p as the selected resolution when the clamshell is open.
<< Safe mode also didn't work. >>
if Safe Mode does not even light up the display (using its default assumptions, Not stored settings) your display (or cable or graphics card) is BROKEN.
That unfortunately doesn't fix it, the display settings for the monitor while the clamshell is open are different than when closed. The external monitor works fine while the clamshell is open
uncheck:
[√] Mirror Displays
... and try again.
Same issue unfortunately.
I don't think so, the monitor works fine with the clamshell open, I'm using it right now. It also worked while closed before I changed from 1080p to 1080i while closed. It's not broken.
Unchecking Mirror displays doesn't fix the issue. Booting in safe mode with the lid closed results in the same "out of range" error on my monitor.
Change external resolution while macbook closed
