My hdmi is not working on my mac


  1. Use a Media Server (free or paid)
  2. Macbook open firmware
  3. MacBook Air HDMI

If using an adapter, check the specifications of the adapter to learn about supported resolutions and other details. If the video on your HDTV or display extends beyond the borders of the screen, open Displays preferences and adjust the Underscan slider for a better fit. Use any of these methods to open Displays preferences:.

Use a Media Server (free or paid)

Quit the app that is playing the video, then open the app again. Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products.

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Contact the vendor for additional information. Other company and product names may be trademarks of their respective owners. Front Page. How Tos. Buyer's Guide. Log in Register. Search Everywhere Threads This forum This thread. Search titles only. Search Advanced search…. Everywhere Threads This forum This thread. Search Advanced…. Catalina causing issues with HDMI. Thread starter LeeW Start date Oct 12, Sort Posts by Likes.

How to fix HDMI output display to TV for Macbook Air.

JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. LeeW macrumors a Original poster. Feb 5, 1, Glasgow, Scotland. Just for those that are having issues with HDMI - HDMI video connections after upgrading to Catalina, eventually managed to get beyond basic support level and spoke to someone who appeared way more knowledgeable. Many are having issues getting a basic HDMI connection to work at all or only through weird and wonderful workarounds.

Macbook open firmware

Of course, no information as to when this may get fixed. For those that are going to revert back to Mojave as a solution, a number of people are noting that this does not fix the issue it didn't for me , indicating there is perhaps some sort of firmware update taking place with Catalina that will not be rolled back when you install Mojave. The most affected users from what I have seen are those using 4k displays, it makes no difference what cable is used they can only get back up and running by connecting to a lower resolution monitor. So just a warning really, add any updates if you have them but it is clearly is an issue and I suspect won't get resolved swiftly.

Last edited: Oct 20, Reactions: Spectrum , Andy P , Mendota and 1 other person. Aug 28, After looking that up, it's apparently an error for the monitor running at an unsupported resolution.

Mine is at x so, not one of the default resolutions. I wonder if I should change it to a standard res? I also set my Energy Saver to "Never" turn display off in case that setting was causing the permanent sleep issue. I had replied to you on the other thread, but even after reinstalling Mojave the issue remained so it does appear to be something beyond Catalina alone, i. But the issues people are experiencing are so wide-ranging there is nothing to pin-point as the definite cause, yet. Jun 21, 62 Prescott, Arizona. I figured installing Catalina was safe because I had several reliable backups that would take me back to Mojave.

Unfortunately, my 4K monitor hdmi to hdmi didn't work under Catalina and continued not to work after going back to Mojave. So, I figured it had to be firmware or something similar. Last edited: Oct 12, Reactions: IowaLynn , kemo and Macintoshrumors. I'm looking on the bright side. Apple [mostly] figured out the Mac Mini wake from sleep woes in the last version of Mojave and I think they'll roll out some fixes quickly.

Frankly, since I have the latest-gen Mac I fully expect to be able to keep it up to date on Catalina. I just hope they roll out the Catalina fixes this week. Reactions: Andy P. Queru macrumors newbie. Jul 29, 19 Good to know. Thank you for letting us know. Reactions: Mendota and LeeW. Fishrrman macrumors P6. Feb 20, 17, 5, I have a Mini i7 connected to a Viewsonic 27" p display My internal drive has Mojave on it.

MacBook Air HDMI

I have an external SSD with a copy of Catalina on it. Both OS's exhibit the same behavior re the display. That is: 1. Reactions: Originalbitman.