Mac pro dual monitor issue

A loose connection will keep a proper electrical connection from occurring and can cause issues with your external display.

Use more than one 4K Ultra HD TV

Are you using the right port? Make sure your display s are plugged in to the correct port s.

Connecting an external monitor to your Mac

If possible, remove one of the adapters and avoid chaining them together. Does the display work with other connections? Try using another computer or another video source and see if the display works with that video connection.

Is your video cable bad? Try using a known good video cable and see if the problem persists.

How to Use Two Monitors on a Mac |

Often times, the video cable connecting the external display to your Mac just needs to be replaced. Problems with display resolution will cause problems with your picture. With resolution issues, your picture may look blurry, or scaled incorrectly. Typically when you plug an external display in to your Mac for mirroring, your Mac will automatically adjust its own display resolution to fit the external display. Not all resolutions translate well to others, and this will cause scaling issues that make some things look elongated or too tall.

Try setting your display to use the default resolution for the display from the same preferences pane discussed above. If this ever happens to you, Apple suggests booting into Safe Mode on your Mac to see if the settings can be reset to default.

Fixes for External Display Not Working on macOS

Sometimes, an updated version of macOS may include drivers pre-installed, so always make sure macOS is up to date too. Sometimes, different external displays will look better with different non-factory color profiles. Play around a bit with these settings until you see something you like.

How To Connect Multiple Monitors to MacBook Pro / Air

You can typically press them on the monitor itself to adjust the contrast and make colors easier to distinguish between. If the display looks too orange for you, then give it some more green and blue.

If it looks too blue for you, give it some more orange and green. Your eyes use light to distinguish color. Skip to main content.

Basics first

Connect the two monitors to your Mac and turn them on. About the Author Andrew Tennyson has been writing about culture, technology, health and a variety of other subjects since Accessed 11 July Tennyson, Andrew.

How to Use Two Monitors on a Mac. Small Business - Chron. Note: Depending on which text editor you're pasting into, you might have to add the italics to the site name.