Q: No Signal on HDMI TV After Lion Upgrade

Thanks a lot - this looks like an easy enough workaround. I'll give it a try if this inconvenience creeps up on me again.

Once more: many thanks

Hi have same issue with my mac min i5 2.5 on new monitor liyama e2775 anyone tryed to conect directly from hdmi to hdmi?

Any news about this issue?

Regards Ged

Anyone try the 10.7.2 update to see if the problem is fixed? The Apple notes accompanying the update don't seem to mention the Mac Mini HDMI issue.

A simular problem (only effecting audio) began on my 2010 mac mini for the first time today, after updating existing lion install to 10.7.2. https://discussions.apple.com/message/16340146#16340146

same here no audio after 10.7.2 update neither via HDMI nor audio jack

aw jeez. I guess its mainly for ios5/icloud stuff then. So still waiting for 10.7.3... This is getting really frustrating..

My macmini is useless after 10.7.2 upgrade! NO AUDIO FROM HDMI. Since I use it as a media server, it is completely useless from now. APPLE, please correct this enormous failure !!!!!

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.  

To all those with audio problems, if you have anything plugged into

the headphone/line out jack of the Mini remove it.  Some reports

on other threads say this is fixes the issue.  SOme ahave also

just plugged something in, waited, then removed it and audio

again worked on HDMI.

For some reason, there is some very low level link between

the line out and HDMI audio which developers can't seem to

get working right.  Probably the original engineer is gone

that developed the Mini and took that secret with him/her.

Seems that this device does not support HDMI 1.4?

no, it looks like it only supports up to HDMI 1.3

Just want to add my voice to this.

Mac Mini 2011, with Lion 10.7.1, connected HDMI to a Cambridge Audio Azur 650R, which in turn is connected to a Panasonic AE-4000 projector.

When I boot, I get the initial apple screen, and then it flicks and turns black. Obviously, it could not negotiate resolution with the projector.

If I connect directly to the projector, it worked for a few weeks, but now I got a black screen also.

Just as a heads up, I ran into some issues today, having no HDMI output, and I found this forum thinking it was an issue with having just upgraded to 10.7.2. While fiddling around with the wires and going crazy, I remembered that I installed the latest Adobe Flash Player update today (the time I started having troubles).  After uninstalling Flash and restarting OS X, the HDMI output worked and all is okay. So it might be worth a shot for those who have installed the latest version of Flash to uninstall it and see if that works. (I know it's kind of stupid having to uninstall Flash, especially since it's a pretty key piece of software...) Hope this has saved some of you some trouble.

I went back to use the HDMI connection and it seems to work intermittently... I hope this issue gets fixed in a future update. At least I'm able to use it at all.

Yes this issue is extremely intermittent and frustrating for me and always at the wrong times!

I have to turn the mac mini on and leave it for a good 5 - 10 minutes before anything will appear on the screen. This had sorted itself out for a couple of weeks but this problem is back.

I haven't seen the first apple boot logo since I have upgraded to lion. This means I can't boot into my windows partition on the first white start up screen. Lucky I use parralels with my bootcamp partition too.

When I do eventually get to use the mini I can't RESTART it. The mac will shutdown but there will be no start up. BAM no video.

I haven't yet seen a repsonse from apple on this forum (I'm not sure if they even do post to the forum as this is the only thread I've posted on). I'm going to trying ringing them this weekend for a response, but if not what then?