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:.
Monitor - Connecting to a Mac
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. 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. 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. 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?
Two Main Methods
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. If your problem is that you have two female or two male connections then the solution is to buy a male-to-female adapter. Cable too small between the two devices?
Specification of the Mac mini
You should be able to hook up your adapter to the screen via a third-party cable. Just make sure it has the correct port type. You may be able to find one, but we can't guarantee that it will work as it appears third-party adapters do not work with Macs that have been updated to macOS Sierra and later. Theoretically you shouldn't be able to attach a monitor to a USB port, but a few companies have treated this as a technical challenge. To learn if your Mac is compatible, check out Matrox's Mac compatibility listing, where you'll also learn the maximum possible output resolutions - it's unlikely you'll be able to run all three displays at p, for example.
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There are also some no-brand devices on eBay and Amazon that offer the same functions as the Diamond product, and are cheaper to boot - although be sure to check for Mac compatibility. Turn on your Apple TV. Press your TV's Power button. Select Everyone in the menu. Open the Apple menu. Click System Preferences…. It's near the top of the drop-down menu. Doing so opens the System Preferences window. Click Displays. This computer monitor-shaped icon is in the middle of the System Preferences window. Click the Displays tab.
It's in the upper-left corner of the window. Click the "AirPlay Display" drop-down box. This option is in the lower-left side of the window. A drop-down menu will appear. Select your Apple TV. Click your Apple TV's name in the drop-down menu. You should see your Mac's screen contents appear on your TV after doing this. Change the TV's resolution.
Check the "Scaled" box, then click a resolution. This will allow you to match your TV's resolution to that of your Mac if your TV is a high-enough definition. You can't use a resolution that's higher than your TV's built-in resolution e. Change the screen scaling.
How to Stream Video to a TV from a PC, Mac or Phone | Tom's Guide
Click and drag the "Underscan" slider that's at the bottom of the page left to show more of your Mac's screen on the TV or right to zoom in the screen. This will help you fit your Mac's screen to your TV if the image on the TV is too large or too small. Open the Sound menu. Doing so will bring up the Sound window. Click Output. It's at the top of the Sound window.
Doing so brings up a list of speakers to which your Mac currently has access, one of which should be your Apple TV. This will ensure that your Apple TV outputs the sound from your Mac. Method 3. Open your Mac's Apple menu. Click System Preferences. It's near the top of the Apple drop-down menu. This monitor-shaped icon is in the System Preferences window. Clicking it opens the Displays window. Change the "Underscan" value. The password will be displayed on your TV. Watch the video the same way you normally would on your phone or tablet.
You can control screen mirroring right from the home screen. Turn it off the same way. Required Transmitter: Android device or Windows 8. Miracast was supposed to be a simple and unifying screen-mirroring solution; instead, it kind of, sort of, almost works as intended. In practice, however, you need an absolutely flawless Wi-Fi network and a little bit of luck.
Every Android phone is a little different, and yours might have a simpler way of doing this. Incidentally, if you see a Cast Screen option elsewhere on your phone like in the toolbar , it does the same thing. You may not have to dive into the Settings menu. Your phone or tablet screen should now be mirrored on the TV. If you want to break the connection, just go back into the Cast Screen options, and choose Disconnect.
Newer machines with Windows 8. Your screen should now be mirrored on your TV. To disconnect, just click the device on the connected display again. Quality media server programs are a dime a dozen, especially on Windows and Android. For paid options, we like Plex and PlayOn, but neither one is necessary.