Samsung monitor no longer goes to high resolution

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Level 1

16 points

Samsung monitor no longer goes to high resolution

I have an iMac, about 2015, running Sierra 10.12.6. I have a Samsung 32inch external monitor (2560x1440).

All of a sudden, when I started my computer up this morning, the Samsung does not go to high resolution.

Out of the blue. It's worked perfectly for 2 years. Like it got amnesia.

I go to the usual display set up, and use "Default for display" and the monitor and computer think that the default display is the lesser one.

Help? Thanks.

Posted on Jul 29, 2019 1:51 AM

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Answer 1

cyrano7 Author

Level 1

16 points

Jul 29, 2019 3:18 PM in response to den.thed

Thanks. I did not know the trick about the Alt and scaled button.

The problem solved itself. I had moved the computer and monitors to the other side of the room, and when I hooked the cables back, the Samsung resolution was lowered. The odd thing is, when I went to the settings on the monitor itself, it said it was 1920.
After unhooking and hooking the cables 3 or 4 times, it worked.
I also have a 24inch HP 1920 monitor. At one point, if the HP was not hooked up, the Samsung worked at 2560. But, when I hooked up the HP, the Samsung went back to 1920.
All very odd. I used HDMI cables and maybe the adaptor momentarily went on the fritz.
Thank you very much for the help.

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Answer 2

den.thed

Level 10

81,802 points

Jul 29, 2019 3:26 PM in response to cyrano7

I'm glad to hear that everything is working as expected, you're welcome!

If it flairs up again, try resetting the NVRAM, as per > Reset NVRAM or PRAM on your Mac - Apple Support

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Answer 3

cyrano7 Author

Level 1

16 points

Jul 29, 2019 3:31 PM in response to den.thed

Thanks. While I have you, if you would be so kind. My Mac is 27in, late 2013, 3.2GHz Intel For i5, and the graphics is NVIDIA GeForce GT 755M 0124 MB.

Presently I have 2 external monitors, Samsung32 and HP27.

Could this iMac handle two Samsung 32 in monitors?

Thanks.

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