![]() Everything you see is based on the TV or monitor model. If your Mac is connected to an HDTV, this list may also include alternate refresh rates and display modes if supported by the hardware. Those using a 4K display can also click Show low-resolution modes to access the aforementioned low-rez options that will get upscaled via the device. When using the above steps, the row of five recommended resolutions gets replaced by a complete list of ALL supported resolutions. To shut down, click Shut Down or press S. To restart your Mac, click Restart or press R. The Phillips TV above required this step because the top and bottom areas were not viewable. View the test results Apple Diagnostics shows a progress bar while it's checking your Mac: When testing is complete, Apple Diagnostics shows the results, including one or more reference codes: To repeat the test, click Run the test again or press Command-R. If you like a particular setting that fills the screen but cuts off the edges, slide the Underscan slider until it properly fits your display area.Once you’ve found your desired resolution, click its entry in the list to switch your display.Press and hold the Option key on your keyboard, and then click the Scaled option again.Thankfully, these resolutions are still accessible, and here’s how to access them. ![]() While adequate for the majority of users, these five resolution choices (default and scaled) are missing several “in-between” display options, as well as “low resolution” modes, such as a true 2560×1440 that must be upscaled by the monitor and may be necessary for testing or software compatibility purposes. On the Phillips HDTV, OS X suggests a “default” resolution of a Retina-scaled 1080p equivalent, and we have the choice to set other resolutions (“scaled”) including 1280 x 768, 720P, 1080i, and 1080p. Click on Scaled to view the display choices.Īn actual PC monitor usually displays a “Looks like # x #” resolution underneath the TV image in the options window. The exact resolutions will vary depending on the specifications of your external display. If you prefer a different screen size, OS X gives you four other options. By default, in recent versions of OS X, you’ll see a “default” recommended resolution for your external display.Select the window residing on the display you wish to modify. If you have more than one screen connected to your Mac, a new Display Preferences window will appear for each one. To change the resolution of your Mac’s display, head to System Preferences > Displays.Here’s how you can override OS X’s automatic and limited suggestions and choose any supported resolution for your external monitor, a Philips FTV HDTV in this example. Setting Custom Resolutions for External Displays in Mac OS X
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