If you see similar issues in only one window or app, check with the app's developer for updates or more help.
Apple Thunderbolt Display
Make sure the external display's power cable is securely connected and that your display is turned on. If you're using a display hub, switchbox, or "KVM," try connecting your display's video cable directly to your Mac instead. Disconnect the video cable where it plugs into your Mac, then plug it back in to reseat the connection.
If you're using a video adapter, unplug the video adapter from your Mac, then plug it back in to reseat the connection. If you're using more than one video adapter to connect your display the adapters are "chained" together , try connecting the display using only one adapter if possible. Some video adapters can't be connected together.
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If your display has more than one video connection, see if using another connection on the display works. If possible, check to see if using a different display or a different adapter works. Try using a different cable that you know is in working order. Check with the display's manufacturer to make sure you're using the cable they recommend. If you're using an external display, sleep and wake your Mac to make it check for connected displays:.
Wait a few moments, then press a key on your keyboard or click your mouse or trackpad to wake your Mac. If there's still no image, or the image appears torn or scrambled, try selecting a different video resolution in System Preferences. If you're using an Apple Display, press the increase brightness key F2 key image on your Apple keyboard. To adjust the brightness of a secondary display, press Control-F2.
If you're using a display that's not made by Apple, check the documentation that came with your display to see if it includes built-in controls for adjusting its brightness or contrast. Make sure your display resolution in System Preferences is set to its default.
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If you're using a resolution that's scaled, the image might be magnified to fit the display. This can cause the image to look blurry in some apps. Check your display for a "monitor mode" setting to get the best video quality.
If your entire display image seems too dark or too bright, you can adjust the brightness and contrast from the Displays pane of System Preferences, or by using your display's built-in controls. To adjust the brightness of your Apple display, press the brightness key F2 key on your keyboard.
Displays not made by Apple sometimes have brightness and color adjustments built into the display. Check the documentation for your display to see if it includes built-in controls.
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When you connect a display, projector, or HDTV using an HDMI cable, you might see a difference in video quality if your display is set to television mode. Check your device for a "monitor mode" setting to achieve the best video quality. You can also calibrate each display from the Color tab of Displays preferences to get the best color and brightness from your display.
For example, this is the adapter that you should use to connect your MacBook Pro to an Apple Thunderbolt Display or a third-party Thunderbolt 2 storage device. This adapter doesn't support connections to Mini DisplayPort displays, including the following Apple adapters and displays:. If you're using the Thunderbolt 3 USB-C to Thunderbolt 2 Adapter to connect to a compatible display and the display doesn't show an image, try unplugging the adapter and plugging it back in.
If your adapter is not made by Apple, that might just be the issue here. The only solution if this is the case is to purchase an Apple adapter.
USB-C power delivery
If you have an Apple adapter and your external display isn't working, try the following:. If when you turn the display back on it's still not working, click on the Apple logo and choose Sleep. If that still doesn't work, try restarting your Mac in safe mode and then reset the display resolution to defaults. When you connect your display and your Mac the display should automatically be detected. But what should you do if it isn't?
As we explain above, if your adapter is not made by Apple that might just be the issue here. If you are using an Apple adapter, try the following:. There is more than one kind of DVI adapter and the likelihood is the one you have is different to the adapter you are using. For example, you may require space for four analog ports around the flat blade. Kyle for Lenovo.
Why An Additional Display?
Get answers from your peers along with millions of IT pros who visit Spiceworks. Is there any cheapish way to get both monitors to display at the max resolution? Best Answer. Popular Topics in General Hardware. Which of the following retains the information it's storing when the system power is turned off? Ghost Chili. On June 28, , Apple introduced a redesigned line of Cinema Displays, along with a new inch model that, like the inch model, carried the "Cinema HD Display" name.
The new models had an anodized aluminum enclosure that matched Apple's high-end lines of professional products. An alternative stand or a wall mount could be used with a VESA mount adapter kit that was sold separately. Though the display enclosures had not been redesigned for a long period of time, several "silent" improvements were made to the brightness levels and contrast ratios.
Currently, no Macintosh is sold with a dual-link DVI port. However, all current Macs come with a Thunderbolt connector which can be used with a separately sold adapter [3] to run the inch display.
Discrete MacBook Pros are also capable of driving the inch display, while all Macs released after October require an additional adapter. On October 14, , the inch Cinema HD Display was replaced with a inch model made with aluminium and glass, reflecting the appearances of the latest iMac, MacBook Pro and unibody MacBook designs. The display features a built-in iSight camera, microphone and dual speaker system. A MagSafe cable runs from the back of the display for charging notebooks. This display is only officially compatible with Macs that have the Mini DisplayPort connector.
A third-party converter must be used in order to use this display with older Macs. With the introduction of LCD panels, the matte, anti-glare screen panels were retired, except for the 30" Cinema Display. Apple had already moved away from matte screens in its line of iMac desktop computers on August 7, Apple had not offered any equipment with a matte, anti-glare screen after the 15" non-Retina MacBook Pro was discontinued in October until the introduction of the Pro Display XDR in