Q: Mini display port to HDMI problem

Hi all, I have an HDMI Mini Port cable wich I bought somewhere on the net (can't remember where) and it is working fine, or at least, it's been doing it's job a few times before with different screens. I just moved to my new place and now, I have a **** cool setup with a benq 23" computer screen and a 40" samsung, both hd 1080p, etc. I have two HDMI cables on my desktop to quickly access both screen, I only have to choose wich hdmi cable to plug in the miniport adapter.

Both already worked fine but now, it seems that switching from one to the other in less than a minute made os x 10.6.8 blind and decided to ignore my second display. Duplicated screens with the samsung to watch a movie, unplugged the samsung, plugged the other screen, mbp's screen flashed blue faster than most of the time and I get no display on the benq lcd, I unplug it, flash very quickly again I try the samsung again, does the same thing: flashes and no display detected. I did reboot the computer and it did the exact same thing, both screen worked one after the other and then, nothing. I never had signal loss with the adapter, even moving it around. All my cables are fine. probleme sounds software related.

I just tried to wait a little with the screens off and hdmi cables unplugged, (5minutes typing this wall o text) and display's fine with the samsung. unplug it flash blue as usual, I plug the benq, and flashes very quickly and no signal. Now samsung's not working anymore. it's time related! ***! I don't want to drink a cofee waiting for un unknown lapse of time only for switching multiple display!

Seems to be a screen detection probleme. Can't figure out how to fix this. Only being patient works for me. powering off screens and waiting a few minutes before plugging back and not switching too quickly from a monitor to the other.

Forgot to say I tried hitting the detect display button in configs, but it's not working either.

My Apple brand mini DVI to HDMI worked great for first month….since then it rarely works.

Yesterday HDMI released this:

http://www.macrumors.com/2011/07/08/minidisplay-port-to-hdmi-cables-unlicensed-a nd-cannot-be-sold/

I succeeded in getting the connection back using HDMI. I will report my findings in case it helps someone. I have been following this 17 page epic on the HDMI and mini display port with interest as I have had all the issues. On 2 occasions I managed to get the Mac up on the screen, otherwise it was the usual flicker, nothing on screen, and no recognition on the Mac, so no buttons in the Display preferences to get things moving. 

I have the following:

Panasonic TX-P42G20

http://www.hdtvtest.co.uk/news/panasonic-txp42g20-txp42g20b-20100308169.htm

Cabelsson mini display port to HDMI

http://www.amazon.co.uk/Cablesson-Mini-DisplayPort-Adapter-Audio/dp/B002CIHNSK/r ef=sr_1_3?ie=UTF8&qid=1310416236&sr=8-3-spell

White HDMI cable from Amazon

Blue Cambridge Audio HDMI cable from Richer Sounds

In the end the cure was simple. I switched the HDMI input to HDMI2 as opposed to HDMI1. On this Panasonic TV, the HDMI connections for HDMI 1,3 and 4 are HDMI v3.1 whereas HDMI2 is v4.0. HDMI2 is also an ARC connection for Audio Return, used when needing the TV sound to go back to an AV Receiver (which I do). I found that by using the v4.0 connection it worked with the Mac but on the v3.1 it doesn't.

I haven't gone through the tests methodically. The only other scenario is the white HDMI cable versus the Cambridge Audio HDMI cable. The white one wasn't working on HDMI1(v3.1) but the blue one worked with HDMI2(v4.0). Perhaps the Cambridge Audio was better quality and worked. I might try that next time and see what happens.

If anyone else has any luck with different HDMI versions on a singular device, please report back, it could shed some light on the issue.

I've tried everything on this ridiculous 17 page HDMI not working-athon that Apple refuses to address with an overall fix.

I bought a cheap one last year when I got my 17" mid 2010 MBP it worked for a month or so then quit. Bought the Moshi adapter in January it worked until yesterday. I'm sick of spending money to do this basic function because Apple doesn't offer their own HDMI support. Screen flickers blue, then nothing. Tried everything recommended here and nothing. I know Lion is coming next week and I want this resolved before then and it's worked already for months. This is my second round of dealing with this and if they tell me I need a new newer best bestist adapter they can keep their trap shut. I have 5 HDMI devices and used all of their cords, nothing. I will try the local Apple Store here in Vegas but my Samsung Syncmaster 2493HM 24"monitor is on a Bretford Desk Mount and I will not be taking it off of there to bring to the store. Any recommendations would be appreciated.

MonoPrice miniDisplayPort to HDMI cable 15'

MacBookPro6,2

Multiple LG and Samsung 1080p displays.

I initially purchased this cable from MonoPrice 4 weeks ago. It arrived, and I could not get it to work with any of my displays or any of several MacBooks and MacPros. No response on the displays or the computers when connected.

The Apple miniDisplayPort to DVI adapters with DVI to HDMI cables that I already own work fine to accomplish this task, but I was eager to get the added benefit of HDMI audio with this new cable.

MonoPrice quickly sent me a replacement cable. That didn't work either. I have now gone through 3 replacement cables, all with the same result. MonoPrice has now determined that all of the cables were defective, and they no longer sell this product.

It seems that when buying "reasonably priced" cables, it can be hit or miss.

It would be cool that someone from apple come here and give out solutions because as mentionned a few post ago, I have a hdmi to minidisplay port adapter with an hdmi cable and I sometimes it works, sometime not. when I plug it, macbook pro flickers blue and when I change sources on the tv, the mac flickers too so there's got to be some kind of signal going throught this cable...

Do I have to buy and buy again and buy and get that apple branded adapter wich is probably totally the same as mine but with a different name on it.. If I remember, I bought it on monoprice a while ago. It worked fine when I fisrt bought it and tested it with my benq, now that I need it, it only works when I restart everything unpluging everything. And even then, it still don't work everytime.

Just so you all know. I have been having this issue for three months or so ever since the software update.

I have read from about page 5 of this epic thread to here and tried every solution.

I am using the iWires MDP to HDMI cable. It worked well on my old Panasonic 32" until the update and then stopped working. However it still works on my LED screen (acer 27" display).

I have ruled out the hdmi sockets. They work.

I have ruled out the wire/adapter. It works on my monitor.

It is definately a software problem... It doesnt work on my New 42' Panasonic either.

I am also VERY SORRY to report that today I UPGRADED to OSX LION 10.7 and ... still the same issue.

My monitor works, my HD TV does not.

Apple has done nothing to fix this issue in Lion...

Ok I am haveing a simalar problem. I have both a 17in mac book pro, and a 27in iMac, the mini dp to hdmi cable works with the laptop but not on my iMac. I can't figure it out. Both computers see my tv and call it the same thing, I can change settings but nothing changes. ***? I hope apple addresses this although this first guy posted in late 09 and still no responce from mac.

****, seems that everyone is having this issue, my mini to hdmi cable was working fine until I decided to upgrade the OSX to 10.6.8 in order to install OS lion, then it just stopped working.

Monoprice MDP to HDMI worked great on 10.6.8 but now with lion it will NOT!!!

What's up apple???

Update!

If i hook it up to my harman kardon receiver, it works great.

If i hook it up to my Vizio TV (4 years old), it works great as well.

But with my Panasonic TV it will not 0_o

I also just started to experience this problem after updating to 10.6.8 or whatever...I was soooooo happy watching media on my biiiiig TV screen before that fatal upgrade (ah, irony). 

This really is an epic thread and I hope Apple notices and fixes the issue.  I will be glued to this thread from now on.

Same here. I just bought a 2010 13" 2.4 Core Duo MacBook pro, with the lion upgrade. I've been using my 2006 macbook as a media server through the second monitor for a few years now, and it worked great. Very dissipointed that the newest hardware/software won't let me do that task.

Apple, please fix this.

I just got the new Mac Mini (2011) and tried to connect it to my Samsung PN63C8000 Plasma TV and it initially did not work. I had it connected to HDMI 3. I switched it to HDMI 4 and it worked. My HDMI cable is some relatively high end cable that my AV installer ran.

For reference, I was running a Hackintosh with 10.5.8 on it and it worked fine with HDMI 3. I had actually upgraded the hackintosh to 10.6.? (7 or 8, I believe), and the HDMI 3 did not work (got no signal). I assumed it was a driver issue that I was not going to be able to hack, so I gave up on it and decided to buy a new Mini (they were finally good enough to meet my needs.....as a side bar, if you don't have to go the Hacktintosh route, don't....it's not worth the effort from a time perspective.... but prior to the new Mini's, there just wasn't a low-cost model fast enough and in the right form factor for me)... Anyway, I digress. Basically, it seems to be partly a software issue and partly a hardware issue. I'll probably try the hackintosh again on a different HDMI port and see if it works. Will post those results when I get them.