Q: No Signal on HDMI TV After Lion Upgrade

Thanks Jarek.  I tried that and it still did not work.  After a few tries I decided to shut off the TV, shut off the AV Receiver, shut off the Mini, and pull the HDMI out of it.  Then I started up the mini with no HDMI plugged in.  Turned on the AV Receiver, turned on the TV, then plugged in the HDMI and finally it worked.

Man this is a pain in the *** if I have to do this every single time I start up the Mac Mini.  I sure hope Apple fixes it soon.

Yeah guys it looks like this is a normal issue with Lion on all hdmi tvs since I have the same issue with my Samsung HDTV.

It works only if you have it connected to a monitor only so I hope Apple takes this under consideration and fix this soon because I had to disconect all my setup to restore my mac to Snow all over again with a monitor.

Lion makes hdmi minis useless if this is not fix. But then again, they never fix the audio on Snow Leopard when you restart your computer you always had to set manually the audio to HDMI.

Patience my friends and lets wait for an update fix because is not something you can fix.

Just got off the phone with Apple Care again, they say there is no known issue officially yet but asked that I tell everyone here to call in and report the same issue and talk to a senior advisor and give them your TV make and model so they can submit it all to Engineering so a update can generated for Lion to fix issues we are having.

Apple Care: (800) 275-2273

I just took Zbegon's advice and called this in as well. On top of the regular case, the advisor also recommended sending these reports in to apple.com/feedback to try to make this a higher visibility issue. So I add that to the advice of calling in a support case.

On a side note, if anyone else uses AC3 passthru audio and finds they lose stereo sound after playing a video with AC3, let them know that the appleHDA.kext file from 10.6.7 did not have this problem but 10.6.8 and Lion are broken. With any luck, we can get both of these fixed in the first update to Lion.

I think the bug in Lion goes well beyond HDMI.  I have a program called RemoteTap on my iPad and it isn't working either.   The background looks like a checkerboard. 

I really need to get Lion off of this Mini because unplugging everything and shutting it down does not always work.  I'm running a VoIP PBX on this Mini and am unable to get into the system.  I trusted Apple because since I joined them in 2005 I've never had an issue with an upgrade before.  I learned a lesson - wait at least 2 months before upgrading from now on. 

Does anyone know how I can get back to Snow Leopard?

Do you have Time Machine backup?

I do on my Mac Pro, but not on the Mini.  The HD is too small.  Now I cannot get my Mini to display and if I keep shutting my tv off and on I'm going to break it.  I really need to get rid of Lion. 

Hmmm anything else you can plug it into to just see what you are doing?

Just to see what you are doing, you could try screensharing from another Mac. It's what I do to reboot my Mini when the TV won't display anything. At the very least it'd let you see if there are any crashes or errors on screen and let you reboot it normally.

I do have a Mac Pro that's working fine with Lion.  How does a person screen share?   I've been doing it with the RemoteTap software.  I'm not sure of any other way. 

If you have Screen sharing enabled in System Preferences > Sharing on the Mini, just click on your Mini in a Finder window on your Pro and at the top of the right pane you should have two buttons, Connect As and Share Screen. I always have it enabled since it's the easiest way to get access to my Mini when I need to do something that requires a keyboard or mouse.

Message was edited by: Jarek91 (corrected button name)

Thank you.  It was already on when I went in there.  I must have turned it on a while ago.   I couldn't get it to work on my Pro.  I finally hauled out my tv stand, almost broke the tv trying to get the HDMI cable plugged into it directly, but finally I have a display now.   It will not work through my Denon receiver.  Plugging it in directly to the Pioneer Elite saved the day.  However, now I've got a nasty black wire dangling from it.  The main wire is inside the wall.  So much for that. 

I went into the display setting and saw something strange.  It defaulted to PAL instead of NTSC.  I wonder if this could be causing the issue.  I know when I set it up originally it was set to NTSC.  Lion must have changed it. 

What refresh rate do you guys show?

I have both options but it's set to NTSC. That was one of the many things I looked at when I started trying to figure out why my Samsung was reporting "not supported mode" on the screen.

I was hoping that might have been the key to the problem.  It is working now directly connected to the Pioneer TV, but it's not the most ideal setup.

The other thing I've noticed 3 times now is sometimes when I reboot the Mini it seems to get stuck at the very beginning.  The display stays black, and there's no activity on the hard drive.  The PBX does not start up either because the phones all remain dead.  I press the power button hold it until it's off.  Then I turn it back on and it boots up OK.  This happened 3 times, so there's definitely bugs in this Lion on the Mini.  My Mac Pro has Lion on it too but it hasn't had one issue *knock on wood*.  The issues are with the Mini. 

I have the same issue with my Mac Mini purchased from Apple on June 11, 2011 with Lion upgrade connected via HDMI to Phillips 55 LCD TV

What it does now:

1. Hear chime

2. See white screen gray apple logo

3. All white screen

4. Flicks to a blue screen

5. Black and TV displays NO VIDEO SIGNAL message

6. Black screen and TV displays Unsupported video format message

P-RAM reset has done nothing.