HDMI on macbook pro 2012 retina stopped working.

I have a similar issue with the HDMI port on the Retina Mac. Plugging in an external monitor requires cycling the monitor in order for it to display anything from the HDMI port. Settings > Display > Arrangement panel shows the HDMI connected monitor is recongized and is there. The HDMI connected monitor remains blank until it is cycled (power button or standby on/off both work.) I'm using two Samsung SA450 displays (one connected to the Mac's HDMI port, one connected via adapter to the Mac's DisplayPort) and the builtin Macbook Pro's Retina display.

I have a HD (1920) LG monitor and have no problems using it with HDMI.

I'm having a similar problem with my new Macbook Pro (retina). When connecting to an external monitor or TV via the HDMI port, all I get is a blank screen. When I tried to connect to the TV, it displayed a message about the signal being out of range. When connecting to the monitor via a HDMI-DVI adaptor, nothing appears on screen at all.

The Macbook does detect that an external monitor/TV is plugged in, as the laptop screen blinks on and off when the HDMI cable is inserted, also, the display preferences shows the external screen.

There are not many settings on the preferences, so I think I have tried every adjustment available.

Any fixes or suggestions will be much appreciated.

I also have encountered a problem with the HDMI port on the macbook pro - I recently was in a hotel with a panasonic tv which I hooked up to the HDMI port and it worked without a flaw. Now I'm trying to hook it up to another TV at a friends house and I don;t get anything on the TV and the Macbook freezes up completely! I have to powerdown the macbook and reboot it with out the HDMI plugged in for it to boot up. It is very wierd... anybody else?

I had the same problem too which actually resulted in me exchanging my brand new MBP w/retina. For those of you who did not go through an external speaker, here was my situation. Mac Book Pro w/retina -> soundbar -> into lcd tv monitor = sound output from the MBP with blank screens on both monitors. The weird thing was, when I plugged everything in the 1st two trials, everything was fine... next day blank screens with only sound. Apple, please take a look into this.

So you exchanged your macbook pro/retina and the problem is fixed? Of so then I need to take mine in. I had a thought with regards to If the displays had to be HDCP compatible or something.

Thanks

Well so far its working fine but like I mentioned before, I don't know if it will suddenly decide to go to a blank screen whenever I continue to plug in the hdmi cable. However the past 3 times I plugged it into the LCD via soundbar, no problems, yet...

I went in to the Genius bar the other day and they had noidea about what was happening. In addition I have not seen anypost with regards to what Apple is saying about it or even if they know about it. If it was a widespead problem then then a software issue may be involved vs. a hardware abnormality; thus a driver issue and possible fix in ML may help. But I believe that these are isolated issue given the lack of customer coplaints/ posts on this discussion and no reputable tech site/blog has reported an issue. I'll take mine in when I get home from my trip. To those of you that did, did they replace or take it in for repair?

i also have an issue trying to connect my retina macbook pro (using mountain lion) to my samsung hdtv via hdmi. the screen turns blue for a second but nothing changes on the tv screen. also when i look in the display settings, i do not see any external display options or settings. i tried what the original poster suggested and rebooted with it connected. that is a temporary fix but even that is buggy as the macbook pro's screen itself shuts off and the tv becomes my main and only display. i'm seriously confused.

it's pretty frustrating that my 6 year old macbook works better in connecting to the tv than this brand new machine. i live in seoul, south korea so it's not like i have genius bars here to go to either.

any help would be greatly appreciated!!

So an update on my earlier post. After having my MB exchanged for a new one a month ago, have have not encountered the same problem. Both the retina screen and the hdtv will flicker a light blue once or twice, but both displays will work properly.

I experienced a similar issue and discovered it was due to gfxCardStatus. If you have downloaded this application, you must ensure that "Dynamic Switching" is enabled when you connect using the HDMI port. The HDMI port apparently calls upon the discreet graphics chip and unless the computer can switch, you will be met with a variety of issues, including a blank screen, inability to watch full-screen movies, etc. Just turn on "dynamic switching" (or quit the app) and give it a go. Worked like a charm for me!

two steps

Thanks for the tip with the gfxCardStatus. Indeed, after setting to Dynamic Switching, the connected monitor on HDMI lit up nicely.

HOWEVER....the sound remains on the rMBP, and the monitor (well HD TV) remains silent.

If someone could solve this one too, I think we have a winner.

Thanks for help!

got the sound

in another discussion I found the solution. Here for anyone as stupid as me....

in the System Preferences.....Sound.....as soon as you plug the HDMI, an option called XXXX HDMI will appear. On mine it says SHARP HDMI, because I have a Sharp. If you have Toshiba, it probably says TOSHIBA HDMI.

Click on it, and you are in business.

Enjoy the rMBP as much as I do.

In you sound settings under preferences, make sure you have your output set to your TV.