Q: No Signal on HDMI TV After Lion Upgrade

Well, fired up the system this morning, and everthing

was just fine with Lion.  So something I had done actually

worked(see previous post).  Something I do recall was that

when I was able to get the system to boot when I was having

all the problems, the Apple on the gray boot screen was

quite large and now it is small.  It was like it was booting

at some lower resolution other than 1080p.  Perhaps the issue

is that screen resolution is not getting determined at boot time

and there is no fall back.  As stated in earlier post, I did change

the resolution and then changed it back.  Maybe that did force

something to change.

Anyway, things seem fine now, almost.  Still has the audio issue

that was present in 10.6.8.  That is, playing DTS or Dolby material

kills playback of stereo tracks without reboot.  There is a

workaround by reinstalling an old kext, but don't really want to

mess with system stuff.

ps.  PLEX (9.3.3) played back my 1080p material without issue and

        Netflix appears to be working just fine (uodated to latest

        Silverlight)

Yesterday morning finally I Found out a permanent? solution to my HDMI problem. And it is the same as you describe above. I found out that if I boot my Mac mini at 720p then there was not any HDMI signal. When I changed the resolution to 1080p boot my Mac mini and everything was fine. If I change the resolution after boot and forget it at 720p (1280X720) and then shut down or restart the Mac mini the no signal on HDMI problem comes again.

I believe that is the solution for some of you guys as described at woodmeister50 and my post.

Give it a try..and good luck until an official fix from apple.

The problem for me is he opposite of what you are describing that you are doing. I leave my mini running all the time and I simply turn off my Denon receiver and TV. When I turn my receiver and TV back on, I get no signal. One thing I've noticed is screen sharing when the AV stuff is off shows a different resolution than when it's turned on so it appears to be changing display modes. For whatever reason, it seems like switching back to 1080i doesn't wake up HDMI or kick off a handshake or something.

I suppose I could try turning off the mini but that'd require me to go to my entertainment center and turn it on every time I want to watch something which kinda defeats the purpose of having it set for access via my Harmony remote. Besides, it's hosting some other services on my local network I prefer to have constant access to.

My Denon receiver is doing the same as yours Jarek.  Once i turn things off, I cannot get them connected again.  I'm now using it without going through the Denon receiver, but it ***** having to connect it directly to my TV.  I cannot shut my mini off.  There are 22 voip phones connected to the mini - some remote, some here in my house.  Shutting it off puts these phones offline, so this is a huge issue for me.

I was reading through these comment thread last night.

I have a 2010 HDMI Mac Mini which I used with a 2010 Samsung 40" LCD TV as the display connected through HDMI, almost always at 720p resolution. After upgrading to Lion on the first day it was released, I found that if the Mini went to sleep and I tried to wake it up, I would get a no-signal message on the TV. This would happen rarely with Snow Leopard, and could usually be fixed by powering off the TV and powering it on again. This didn't work with Lion; I wound up having to force-shut the Mini down.

I experimented last night, and discovered that if I switched to 1080p through the Displays menu in the menu bar, my TV would immediately go black and give me a "no signal" message. This is while the Mini was deliberately in use. Turning off the TV and back on again, made no difference, and neither did unplugging the HDMI cable and plugging it back in after a few seconds.

This is a major problem as far as using the Mini as I had taken for granted with Snow Leopard. I'm relieved to see so many other people complaining about the same issue. Hopefully there will be a solution soon.

Well, maybe my fix isn't as permanent as I thought.

Fired things up last night and got the black no signal

screen.  Had to do ther hard shutdown and

"option+command+p+r" routine again.  And once

again saw the "big" apple instead of the small one

indicating that it was somehow seeing a different

resolution.

I did however realize that I had powered things up differently.

Turned my receiver on first then the TV.  Previous times

bringing up the system, I would turn on TV then receiver.

Perhaps there's an issue there.  In general, it just plain

seems that Lion just totally screws up the HDMI handshaking.

Also, I have noticed that when this happens,  it also messes

with the "option" boot choice, which brings up the screen

to select the different boot volumes is also broken.  It seems that

Lion just breaks initial video setup with HDMI if any alteration

occurs at all!!!  Basically, display auto detect on boot gets

borked!!!!!!!

Before Lion, I could boot with just the TV on (receiver has passthrough

when turned off) and in this state could turn receiver on and have

no problem.  Or, I could turn receiver off and still have video.

Or, I could leave Mini on and turn both receiver and TV off and

later turn on any combination ot TV and receiver and still get video.

With Lion, any alteration whatsoever from a "working boot procedure"

results in a borked system!!!!!!!!!!!!!!!

Exactly!   I have the same issues as my 2010 Mac Mini is now borked too. 

We are at Apple's mercy to have this fixed.  I hope it's fixed sooner rather than later. 

I am having the same issues with the hdmi output when connected to a Denon receiver.  The workaround I am using is to start the Mini with the hdmi cable disconnected.  When the Mini is left ON but not in use, disconnect the hdmi cable from the Mini.  In addition to the hdmi issues, the OS is getting into a Panick mode periodically and asks me to restart the Mini.

2011 Macbook pro + Philips 42PFL5603 + hdmi-cable = No signal

It used to work well on 1080p, but after the Lion update I haven't got any signal at all. If I change the resolution to 720p, the tv says video format is not supported.

I also tried a 24 inch monitor with the same cable and adapter and it worked fine.

Philips' customer service said Philips has never promised compitability with macs, and because it's about 3 years old, there won't be any software updates to solve the problem.

Is this something that Apple could fix with upcoming Lion updates, or should I just forget it and buy a new tv?

I would guess that it likely will be fixed.  I'm surprised that Apple released Lion with such an issue.  As soon as I installed Lion I had the problem right away.  So obviously Lion wasn't testing well with products that the general public are using.  It's also annoying that Philips takes the stance that they aren't going to guarantee compatibility with Macs or other products.  That reminds me - "Do not purchase any Philips products".  Companies that play the blame game are not getting a dime from me.

This stupid HDCP copy protection nonsense has cause the public more headaches than anything I've ever seen before.  3 years ago I had a satellite receiver that stopped working on my TV because of HDCP and I ended up having to use component cables instead of HDMI.  The satellite company stated that certain televisions did not like their flavor of HDCP, yet my TV was only 6 months old.  It's utterly ridiculous.  I'll bet this current foolishness with Lion not working with several displays is all HDCP related.  It sure looks that way as these symptoms are identical to what I had with my satellite receiver 3 years ago.   I'm not sure what these companies are trying to protect with their stupid HDCP.  Geeks out there will always find a way around whatever logic they use to lock things down.  The thing they are forgetting is the consumer.  What about legitimate people like me who wants to just use my TV as a monitor to my Mac Mini and now I can't use it without unhooking it from my Denon receiver and plugging it directly into the TV?  That's not how it worked when I bought it in 2010, and I have not changed my receiver and I have not changed my TV.

I guess the MacBook Pro is now suffering too.  I don't know for certain, but I'll bet the pesky HDCP has something to do with it.  I hope that Apple pushes hard on this one.  My satellite company didn't and we all ended up using component.  That is just very wrong.

Apple tech just called me back, (I'm really impressed) he said that engineering has got gobs of feedback on this issue now(two days ago they acted like I was the only one, so thanks to those who called to report) and they are on it. Not sure what they plan to do but I hope that the fix will be in 10.7.1 as it's release is imminent( I got the 10.7.2 developer seed the other day,no fix there) he did say to keep watch for software updates. I restored to Snow Leopard so I could at least use my mini, so I'm just gonna watch the blogs they usually break the story for every software update. Or one could just go to the App store and see which version is being sold. I will then re-install and hope they fixed the bug.

That's great that they are addressing this issue.  I've been thinking of switching back to Snow Leopard and actually found my installation disks in the basement.  The work and time associated with this is terrible.  I'd have to reinstall everything afterwards.  I learned a good lesson - no more installing new operating systems until they've been around for a long while and are working.

A system which cannot perform a fundemental auto

discovery of a  connected video display is just a totally

unacceptable oversight, especially when there was no

issue whatsoever in the previous OS.

From what I have seen so far, if anything is just slightly

different from ONE set of conditions, you get a borked system.

You then have to jump through hoops to get it back.

This is not the only serious issue with Lion.  Apple is losing

credibility as everyday passes without an update to correct

this issue and others.

Similar problem here.

Upgraded to Lion ->

Mini connected to Samsung HW-C500 receiver -> Samsung LED/LCD 55" series 8000 TV all via HDMI.  I have not been able to see my mini for more that a second.  The TV keeps flashing on the mini desk top for a second then a gray screen then a green screen and the same over and over again.  No luck with unplugging or restarting the system.

Will have to find another monitor to install any upgrade when it becomes available.....

Just adding my voice to the crowd. I'm having the same problems with a Sony Bravia. 9 times out of 10 there is no signal. The odd occasion it did work was pure luck as I did not remove any cables. I am not taking any chances by shutting down I just put the mini to sleep.

Took some of the earlier advice and reported it to Apple.