No Signal on HDMI TV After Lion Upgrade

I just installed Lion on my Mac mini and my TV no longer receives a signal over HDMI. I've tried a bunch of different cobinations of restarting the TV and computer without any luck. Without a display, I can't use Screen Sharing to try chaning any of the prefrences. Does anyone have a solution to this problem? Thanks.

Posted on Jul 21, 2011 1:32 PM

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Posted on Oct 14, 2011 7:17 PM

For everyone who is having HDTV display and digital audio output problems take the advice of a few of the other posters here and go out and purchase Gefen HDMI Detective Plus. It retails for $129 but Amazon has it for sale for around $80. It will fix your Mac HDMI out video and audio problems period. Yeah it ***** you have to buy it but if you have the HDMI problems it was designed to fix you already have spent several thousand dollars on computer and home theater equipment so what is another $80 to keep everything working right.


By way of background, I have a late 2010 Quadcore I7 Imac, which also doubles as a HTPC for a 7.1 speaker set up in my loft with my Denon 4308CI amp and Panasonic HDTV (via a long 100 ft HDMI run). I use the Imac bluetooth keyboard and trackpad in the living room to control the Imac when viewing on my HDTV. The set up worked great with Snow Leopard until the 10.6.8 update killed my digital audio. I reverted to 10.6.7 to fix the issue until Lion 10.7.1 was released and I read on another Apple thread that the HDMI out issues had been solved. When I upgraded I lost both HDMI video and audio and I was hoping that 10.7.2 would solve the issues but it did not.


Anyhow, I was getting ready to go back to 10.6.7 again but read this whole thread for solutions and stumbled on the Gefen hardware solution. After doing some research it seems that many HTPCs have HDMI out problems with software updates and AV receivers and not just Apple. I bought the product, spoke to Gefen tech support before the set up as their instrucitons are a little unclear but after that I set up the product in no time and now everything is working perfectly once again. Best of all, I don't have to worry now about future software updates killing my HDMI out video and audio again.


BTW, if you use a AV receiver with your Imac just use one of the preset Gefen generic codes at set up as storing your HDTV's EDID in the Gefen may not allow you to push multi channel digital audio as well as video from your Imac.

302 replies

Aug 5, 2011 2:40 AM in response to Ratboy

Well, yet another video foopah with Lion. Lion seems

to have severely borked playback of iTunes purchased

HD movies ONCE AGAIN. Tried to watch Iron Man last

night, and every few minutes the video would just stop

for a couple seconds, then continue. Audio was unaffected.


This renders my iTunes HD movies totally unwatchable!!!!!!

The same thing happened with the 10.6.3 to 10.6.4 update.

Only, it would only happen 2 or 4 times scattered throughout

the movie. It didn't get fixed until10.6.6!!!!!!!!!!!!!!!!


Apple can't even update an OS anymore without destoying

usability of its own material. Shame on you Apple!!!!


As I stated in a previous post, all my other video material

plays just fine!!! Maybe it is time to just plain abandon

iTunes as a source for video as Apple cannot deliver its

material reliably!!!!!

Aug 8, 2011 3:54 AM in response to Kevin Canada

I agree with you Kevin, Lion borks Mini's old AND new

and is something that goes beyond HDMI handshaking.

While I was running Snow Leopard, I could turn on any

piece of gear in any sequence and my system would work

flawlessly. I could also just turn on the Mini by itself,

and access it from another Mac using Screen Sharing!


Has Apple become so big that OS people don't talk to the

hardware people or their software people before making

changes? I have been seeing a lot of different threads

in all the forums that are starting to point to this.

Aug 8, 2011 5:03 AM in response to woodmeister50

I'm not sure what the scoop is on why this happened. We all discovered this flaw within moments of installing Lion, so it's not like it was some far fetched bug that you'd only find during very odd circumstances. This issue is clearly happening frequently and even a small amount of testing would have found this.


My theory is the deadline. We know that Steve Jobs said the new Lion would be released in July. We also know that he micro-manages staff and can focus on pretty things at times. Don't get me wrong, I have tons of respect for this man. I just think he pushed to have it out in July because he said it would be ready by then. The developers likely knew darn well that it wasn't ready for the Mini. It's more of an issue with what the boss says goes! That's my humble opinion. :)

Aug 8, 2011 7:11 AM in response to Kevin Canada

I had experience working in that kind of environment Kevin.

The powers that be would proclaim the edict that things will

be in production on such and such a date, even though we

said there were serious issues "they" said it must ship anyway.

So we spent the next months dealing with disgruntled customers

and being accused of being "incompetent".


This, sad to say, has become the paradigm of modern business.

Get it out the door, generate profits, then fix it later.

Aug 8, 2011 7:21 AM in response to woodmeister50

You are happy right about that. It seems businesses all over are doing the following:


- Cutting back on staff.

- Cutting corners to save money.

- Taking shortcuts hoping nobody will notice.


The end result of all of this?


- Poor reputation due to poor product.

- Poor economy due to people being downsized.

- Weakened respect.


I don't know if Apple is cutting staff, but I know many companies and governments even are cutting back on employees in an effort to save money. Meanwhile the workload is the same. You can't expect one person to do the job of 4, and that could very well be the issue we are seeing with so many products today - Lion included. If you want it ready by July, then you need to ensure you're not scrambling right up until the due date. There has to be time to properly code, test, and debug and test again and again.


Anyhow, I think it will all be ironed out. Patches will be sent out that will hopefully fix it up, but still, it's a blow to Apple and very disappointing.

Aug 8, 2011 9:11 AM in response to Ratboy

Ideally of course they would have tested it widely on a variety of equipment. But how many of their core test team, or even the beta group, use OSX on a HDTV? I expect the vast majority of testing would have been on laptops, imac or standard PC monitors (or lovely cinema displays).


You and I know that minis are popular as HTPCs, but clearly that passed someone by. I'm starting to fall out of love with it frankly - the 'it just works' is falling to pieces, and Plex (my client of choice) might have a great media manager, but the playback part still can't change the screen res/refresh rate to match the content after nearly 3 years of saying 'its coming soon'

Aug 8, 2011 9:36 AM in response to mrklaw

It would be interesting to come across someone or people who are having issues with PC display monitors too. I don't really think it's an HDMI issue. There's something else rattling around in there it seems.


Don't lose too much hope - Apple just had to get it out in July and I'm sure they are fully aware of the bugs in it. I've been reading where people are booting up and getting a gray screen with the Apple logo, and a spinning gear icon that just goes and goes and goes. So there are other Lion issues out there besides this one. I hope that they will soon have all of the issues fixed and an update released. That way at least they'll save some face.

Aug 8, 2011 10:31 AM in response to Ratboy

This is something that I find very disturbing:


From this thread:

http://discussions.apple.com/thread/3248110?tstart=0


This is the quote:

"Additional Background: I have had a couple of calls with Mac support and they have been unable to tell me whether this is a "design feature" or a flaw in the Lion OS because they have had no similar reports and they do not have the latest hardare available running Lion Server to test to see if this happens with other monitors. (They also, of course, don't have the VX2835wm monitor.)"


Apple does not have the latest hardware with the latest OS!!!!!!!

I don't know if this poster was just misunderstanding, but if he wasn't

this is very disturbing.


The thread wasn't directly related to our issues, but just seeing such a

comment is disturbing.

Aug 12, 2011 2:44 AM in response to mguertin

Try playing any stereo content before playing any

of Dolby or DTS. This is a bug that was "knowingly"

carried over from 10.6.8 where playing Dolby or DTS

tracks borks all other audio. With Lion, reboot is

easiest fix. Some have in another forum replaced

a .kext driver file with an older version. But, messing

with system files is touchy.


Venturas? Does that fix allow you to turn off the

display with Mini running then turn on again and still

get video? Also, does it let you turn on Mini then turn

on display and still work? I guess I'm asking, does that

fix work regardless of any powerup/powerdown sequence,

or does it just get the display to work with a fixed sequence

of events, like my system acts now.

Aug 12, 2011 7:19 AM in response to woodmeister50

@woodmeister50: Playing a stereo file before Dobly or DTS doesn't help me and rebooting all the time ***** badly ... this is my home theatre machine. Having to reboot every other show or so is a pretty horrible workaround, but at least now with the video resolution fix I can without having to zap the PRAM just to get video back. Let's hope that Apple gets some updates out really quickly, they have really messed this one up. I'm seriously re-considering using a mini for my HTPC now. No blu-ray playback (and there never will be) and now with the latest OS it can't even play more than a couple of videos without having to reboot the machine.


The attention to detail that Apple used to put into their system updates is long gone and has been seemingly replaced with the need to rip out useful tools that people use and change system-wide behaviour's in efforts to have more "bling" for the iOS type users. Also with the un-needed and way overkill locking down of radarweb it feels like microsoft these days, or worse. You can't even verify if things are known bugs anymore without having to spend all kinds of time doing research on support forums to see if other people have the same issue and if they have reported it or not. This really makes me think of the famour 1984 commercial ... but now it's Apple that's on the big screen.

Aug 13, 2011 1:41 AM in response to thomasdesign

That is all fine and good thomasdesign that there is a piece

of hardware that helps. However, display discovery and

configuration is a fundamental function of a modern OS.

It should not be necessary to buy additional hardware to

fix a fundamental problem. Especially when no problem

existed on hardware prior to an OS upgrade.


My Mini has no display issues whatsoever when running

Snow Leopard, but is totally flakey with Lion! Basically

Lion + MacMini ≠ Stability.

Aug 13, 2011 6:10 AM in response to woodmeister50

I finally have solved my 2009 mini display problems with my 23pf5320 Philips!


Yes, you heard me correctly!


All I did was go to Walmart and buy a new 42" Vizio a few months ahead of my planned display upgrade. Display is detected just fine and now all I have to deal with are loss of zoom functionality after sleep requiring restart and rampant colorwheels, other stuff and, oh yeah, half my videos are requiring some new codec in iphoto that had worked previously (<sarcasm> it just works</sarcasm>.


I guess you get what you pay for. $29. I want to forget about all this mess apple, so I hope we can learn about this in future product launches.

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No Signal on HDMI TV After Lion Upgrade

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