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You can also try resetting the SMC using these instructions. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Would you like to answer one of these unanswered questions instead? Home Questions Tags Users Unanswered.

Macbook Pro will no longer detect external display Ask Question. Jason Yost. Jason Yost Jason Yost 2 4 8. To confirm the NVRAM reset did it for me - the laptop looked as if the connector on the board was faulty but I did this and everything is working perfectly. I had the same problem, a simple restart fixed the problem for me. Martin Marconcini Martin Marconcini It turned out to the the adapter cable, I purchased another one today and plugged it in and everything was fine.

Strange the cable seemed to be more resilient. Glad to hear you fixed it.

MacBook Pro: MiniDisplayPort to HDMI not working! | MacRumors Forums

They look resilient but they are not: Can you confirm that the monitor still works with another computer? I have tried with a completely different monitor and cable that I am sure is working. Check my edited answer re resetting the smc.

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See if that works. Related 1. Apple has an online support document that lists all of the Macs that are compatible with 4K displays. Is your brightness turned all the way down?

What could possibly go wrong?

Silly me — I just forgot to turn the brightness back up. Check the power plug on the external display: Hey, things happen!

Connect to HDMI from your Mac

If you live where Earthquakes are common, or you have rambunctious kids running around all the time, plugs are destined to work their way out of their sockets. One of the things Apple recommends you try if you are using an Apple notebook, such as a MacBook, MacBook Air, or MacBook Pro is to connect the power adapter to give it additional power.

Re-seat your video connections: Eliminate the possibility of a loose display connection by unplugging your display cables and plugging them back in properly. A loose connection will keep a proper electrical connection from occurring and can cause issues with your external display. Are you using the right port? Make sure your display s are plugged in to the correct port s. Avoid video adapter chains: 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?

Macbook Pro HDMI port not working? Here's a quick fix!

Try using a known good video cable and see if the problem persists. Often times, the video cable connecting the external display to your Mac just needs to be replaced.

Before you begin

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. Adjust your resolution manually: It is possible for you to manually adjust your display resolution, and it can be done from the System Preferences on your Mac.

MacBook Pro: MiniDisplayPort to HDMI not working!

Choose the default resolution: Try setting your display to use the default resolution for the display from the same preferences pane discussed above. Change resolution settings in Safe Mode: Sometimes you may find yourself unable to change external display settings on a regular boot-up. 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. Check for software updates for your apps: Sometimes specific apps may look blurry. Check for new drivers for your display: Sometimes, an updated version of macOS may include drivers pre-installed, so always make sure macOS is up to date too.