Set up the 2nd screen using non-apple monitor

iMac 21.5 "4K, 10.11.6 Add either a ViewSonic monitor #VA2055Sa, or #VX2253MH as 2nd screen.

A monitor will be visible, but the resolution, which says VS. resolution goes up to 1920 x 1080, but don't not appear in the configuration menu. They have a work around with a PC, but have not been able to find one on the Mac side.

Does anyone else have this problem and/or a possibility of soling it? We have tried to use a PC, but could not work there either. Hoping someone has an idea.

Look for your model iMac tecniques and match the closest resolution to you on your screen. For example, in the http://www.apple.com/imac/specs/ camera and video section, you will find the available output resolutions.

Tags: Mac

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