Problem w/ two 27" LED Cinema Displays on ATI 5770 MacPro

Attempting to connect a second display to a mid 2010 Mac Pro. There are two mini-ports + a DVI on the 5770 card. Currently I have a single 27" LED connected using one of the mini ports. The computer isn't recognizing the second monitor in the other mini port. I used to have an older 24" LCD Cinema display running successfully, using the DVI port on card with a powered adapter. That configuration isn't doable with a newer 27" given the output from it (not the older style video cabling, but rather the mini display port. Would appreciate any suggestions on how to get the two 27" monitors running together.

Hey turbostar, finally a chance to get back to you, sorry about the delay.
I had already tried both ports with no success on the second monitor, but when I moved the primary monitor to the second port and it worked... it it got me to thinking maybe the power outlet was bad if not the monitor itself. Indeed that was the issue. The second monitor was plugged into a power strip in which one of the six outlets on it was not working. Replaced the surge power strip with a new one and all is good.
Thank you for your time and help.

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Does anyone have two 24" LED Cinema Displays on their Mac Pro?

I'm wondering if there are any other Mac Pro users out there with two 24" LED Cinema Displays? If so, are you able to adjust the brightness of both displays? For me, no matter which brightness slider I adjust in System Preferences, only the brightness of one of the displays is adjusted.
I originally created a thread last September:
http://discussions.apple.com/thread.jspa?threadID=2160532
If you have this problem too, please report it to <http://bugreporter.apple.com/>. My original Radar bug was #7222745, and it was found to be a duplicate of #6828443. Based on the IDs, I'd say this has been a known issue for at least a year.
Thanks,
Patrick

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If I install the razer mac driver, I keep seeing error log in console for the kzcorengineand razercorenginer process.
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Thank you

Adjusting brightness with two 24" LED Cinema Displays

I'm wondering if there are any other Mac Pro users out there with two 24" LED Cinema Displays? If so, are you able to adjust the brightness of both displays? For me, no matter which brightness slider I adjust in System Preferences, only the brightness of one of the displays is adjusted.
I originally created a thread last September:
http://discussions.apple.com/thread.jspa?threadID=2160532
If you have this problem too, please report it to <http://bugreporter.apple.com/>. My original Radar bug was #7222745, and it was found to be a duplicate of #6828443. Based on the IDs, I'd say this has been a known issue for at least a year.
Thanks,
Patrick

I filed a bug report at bugreporter.apple.com, and received a pretty quick reply:
This is a follow up to Bug ID# 7222745. After further investigation it has been determined that this is a known issue, which is currently being investigated by engineering. This issue has been filed in our bug database under the original Bug ID# 6828443. The original bug number being used to track this duplicate issue can be found in the State column, in this format: Duplicate/OrigBug#.
Looks like I'm S.O.L. until they fix this!

Two 24" LED Cinema display and getting audio from both

I have two 24" LED Cinema displays connected to a MP. Is there a way to get the audio to play through the speakers on both displays at the same time? I can easily switch the USB audio to either display, but I cannot figure out how to play audio through both at the same time. Thank you for the help,

You can hijack the audio from any application, or the system audio, with Audio Hijack Pro
<http://www.rogueamoeba.com/audiohijackpro/>
You can then use its Auxiliary Device Output effect to send the audio to multiple devices.

Controlling brightness on two 24" LED Cinema Displays

I have an 8-core Mac Pro from this summer with two NVIDIA GeForce GT 120 cards and two 24" LED Cinema Displays. I'm running Snow Leopard 10.6.1, and when I try to adjust the brightness, the slider on both panels controls only one monitor. I therefore can't adjust the brightness of one of my displays. Has anyone found this?

I filed a bug report at bugreporter.apple.com, and received a pretty quick reply:
This is a follow up to Bug ID# 7222745. After further investigation it has been determined that this is a known issue, which is currently being investigated by engineering. This issue has been filed in our bug database under the original Bug ID# 6828443. The original bug number being used to track this duplicate issue can be found in the State column, in this format: Duplicate/OrigBug#.
Looks like I'm S.O.L. until they fix this!

Screen resolution problem - HP computer and LED Cinema Display

I just purchased an HP Envy Phoenix H9-1330 with Windows 8, and I connected it to my 27" Mac LED Cinema Display, but the resolution is horrible. The highest option in the screen resolution menu is 1280 x 720, and I'm getting the error message "Your resolution is lower than 1024 x 768. Some items might not fit and apps might not open". How do I fix this? What kind of issue is this (Windows 8? Graphics card? HP can't support my monitor? etc...)?
I just bought another brand new computer, but not an HP, with Windows 8 and I have no problems with the resolution - it looks absolutely beautiful. I want to use my monitor with my HP desktop though.
Thanks for any help

Still haven't figured it out....
BUT I did notice that, on the back of the computer, there are 2 additional DVI connections that are covered with a black cover and screwed in (and they say 'please do not remove'.... I'm asuming it's because they aren't connected to anything? Or maybe they aren't connected to the graphics card?). Is it possible that just my DVI connection is wrong, and I'll need to connect to one of these covered-up DVI inputs instead? But why are they covered up? Do I need to take it in so they can be connected to the graphics card?? Help! I don't want to return this computer, but I will have to if I can't get the resolution fixed.

Two 24" LED Cinema Displays from 2009 Mac Mini?

I have been using two 24 inch Samsung's with a Mac mini for about 6 months and it's been great until one of the monitors failed me last week. After some research I purchased a new 24" LED ACD and it's a beautiful monitor that blows away my other 24" Samsung. I'm thinking about getting another 24" LED ACD and my question is: Has anyone connected 2 24" LED ACD's to a Mac mini using: http://www.atlona.com/Atlona-DVI-to-Mini-DisplayPort-Converter-p-17859.html
My plan is to use the mini display port to connect one ACD and use the Atlona Converter to connect the other ACD through the mini DVI port on the Mac Mini. I have the Atlona converter ordered and it will be here early next week and I'll report back on the results unless someone else has already done this and knows it works.

Jim Stewart1 wrote:
Just one further question, though - doesn't that mean I lose out on other uses for the Mini's only Thunderbolt port?
No, because Thunderbolt can be daisy chained. Just make sure that whatever Thunderbold Drive Enclosure you get, has dual Thunderbolt ports so that you can chain your second monitor to it.
see > Displays: Mini DisplayPort display must be last in a Thunderbolt chain
Also, can I ask why you suggest putting the 20" on HDMI? If it came to running a single monitor + Thunderbolt RAID setup, I'd like to have the 23" on the HDMI.
Mostly because the Thunderbolt/Mini DisplayPort supports higher resolutions than the HDMI port.
HDMI to DVI only supports 1920x1200
Thunderbolt port supports 2560x1600
Would that be problematic?
Not as long as the 23" monitors native resolution is 1920x1200 or less.

How do you connect two 27" LED Cinema Displays together?

I currently have one screen connected to my MacBook Pro 2010. How do I connect the second screen if I only have one Thunderbolt port?

I Think they can be daisy chained.check your manual for more info to see if your Mac supports this
John b

Select Default iSight Cam with Dual LED Cinema Displays

Hello
I have two 27in LED Cinema Displays, both of which have iSight Cameras. When I try to facetime, by default, the right monitor camera turns on, but I want to use the left camera.
How do I select which camera on which monitor I want to use? Both monitors are connected via thunderbolt. I'm using OS X Mavericks.
Thanks!

You can try the old trick of first launching a camera app that you do NOT want to use - QuickTimeX > New Movie Recording perhaps - to have it engage the ONE display iSight camera. After you can see that your camera is engaged with the unwanted app, you can hide that app if desired. Then launch FaceTime and see if the other connected camera is accessible to FaceTime.
If FaceTime cannot then recognize the second Display iSight, check your System Information utility to see if your Hardware > USB > USB Device Tree recognizes both Display iSights. If the device tree recognizes only one Display iSight, your lowest cost workaround may be to connect a Mac-compatible webcam to one of your available USB ports so it is recognizable . The external camera may then be selectable in your FaceTime menu without the two-application trick.
Message was edited by: EZ Jim
Mac OSX 10.10.2

I have a macbook connected to LED cinema display. The display started to flicker. The display turns black for a second or two. Sometimes I restart macbook and display. Sometimes it helps.

I have a macbook connected to LED cinema display. The display started to flicker. The display turns black for a second or two. Sometimes I restart macbook and display. Sometimes it helps.

same issue, either your wiring or display itself is going bad. for me, it was the display but luckily still under warranty

Problem with Snow Leopard and LED Cinema Display + MacBook pro

I just upgraded to Snow Leopard. When I work on my MacBook Pro everything works fine. But when I use through the LED Cinema Display then the machine hangs on several programs, like iTunes, Time Machine, even Finder. Before the upgrade everything worked fine. Anyone having the same problem?

I've had similar problems when using my cinema display. I am currently using it with my usb backup drive disconnected and , so far, have not had the problems. Here's hoping, although it is not a good permanent solution, it means I do not have Time Machine running or access to my other backup files. I suspect that it may be a problem (as reported by others on this forum) with SL mounting a sleeping drive. Time will tell.

USB Speaker/LED Cinema Display Problems After Upgrade to Mavericks

I just upgraded to Mavericks this morning. My set-up includes a new (Late 2013) 27" iMac and a 27" Apple LED Cinema Display, with the mini display port and USB connected from the display to the iMac.
I have a set of Bose USB speakers that I had plugged into the USB port on the Cinema Display for audio. I didn't want to waste one of the USB 3 ports on the iMac so instead was using a USB 2 port on the Cinema Display. This worked fine before upgrading to Mavericks.
Now with Mavericks installed, if I have the speakers plugged in, I get a tone that sounds like very loud feedback. If I plug the USB speakers into one of the USB 3 ports on the iMac however, it works fine.
Does anyone know if this is a known issue with Mavericks? I've read some other posts about display issues, but they were referencing USB displays. In this case the display is connected via mini displayport, but the USB connection on the display seems to be causing issues.
Anyone else experienced this?

I've been experiencing additional issues with USB speakers. I plugged them into a USB port on the iMac itself (as opposed to the LED Cinema Display) and the feedback was gone. However, now I get situations where the audio appears to randomly "die" on the system. If I go into Audio preferences and switch the audio output to the internal speakers, the audio comes back on. If I then switch it back to the USB speakers, it continues to work until it randomly dies again. This happens typically 3-5 times a day.
If I just use the internal speakers as the audio output, I don't get any issues with losing the audio. The USB speakers worked fine on the iMac before upgrading to Mavericks, and still work fine on my late 2011 MBP still running 10.8.5.
I've read about other similar issues (http://www.imore.com/losing-audio-os-x-mavericks-heres-what-you-can-do-about-it). Still waiting for a fix.

Extension cable for Apple 24" LED Cinema Display

Purchased the newly refreshed Mac Pro (Intel Xeon “Nehalem” processor) and an Apple 24" LED Cinema Display. (The new graphics cards support the mini displayport.) They work well together and I am happy with the results.
There is a snag. The cable on the monitor is too short to reach my computer, which needs to go under the desk. The cable on the display is hard wired. I would prefer not to drill a new hole in the desk if I can avoid it.
The obvious solution would be an extender cable. I find a number of cables that support the displayport standard, but all are M to M. In fact, Belkin notes that their cables are NOT for Apple's mini displayport. The Apple store has nothing on its site, call to the Apple store yielded no solution, and I live four hours from the nearest Apple store. Apple after moving to standard solutions appears to have gone back to a proprietary one again.
I cannot be the only one having this problem. Anybody found a way to extend this cable?

It is around two feet long. I would not have a problem with this if I could extend it or Apple had adopted the standard cable with female connector on the display so I could purchase a longer cable. Apple has a long history of slipping into proprietary solutions that are often good (e.g., magsafe on MacBook) but tend to cramp ones ability to come up with solutions they have not thought of.
There are a growing number of m-m cables that would work from various vendors like Belkin, but I have found no extenders from Apple or any other vendor.
As to the monitor itself, I LOVE it. I am sure there will be a solution eventually. I have the new Mac Pro and monitor on the kitchen counter. Not sure how long my wife's patience will last.

27'' LED Cinema Display flickers when powering MBP and dimmed down

The 27'' LED Cinema Display flickers (backlight flickers) in the following situation:
* The display powers an MacBook Pro (e.g. later 2010).
* The MacBook Pro is fully charged (i.e. power is not used for charging).
* The MacBook Pro performs some GPU intense task (moving the mouse over the dock with magnification enabled).
* The brightness of the display is dimmed down to one of the lower settings (one or two "bars").
The problem disappears if the MBP is powered by an independent charger.
We reproduced the problem with two different MBPs (13'' and 15'') and two different displays.

Same problem here! I bought two brand new 27 inch Cinema Displays, one for work and one for my home office. Both showed the problem. I returned both, go replacement displays and both show the same problem. I am using them with a 13 inch MacBook Air late 2010. I use them with the MacBook's display lid closed and powered by the Cinema Display. The problem only occurs when the display brightness is at 1 to 5 bars. From 6 bars on everything is fine. I also noticed that the flickering is stronger when I USE the computer, i.e. dragging around windows, typing, etc. When I just look at the screen, the flickering occurs more sporadically. The flickering looks like a short switching off of the display light (a few milliseconds).
I just tried the hint suggested in this thread and indeed, when I open the lid and have the MacBook running on batteries (not powered by the Cinema Display), the flickering is gone! So it really seems to be dependent on that.
Please fix it, Apple! This is not acceptable for a premium-quality display! We have already done a good job narrowing down the conditions under which the problem occurs. You should easily be able to reproduce the issue like this:
- use a MacBook (e.g. new MacBook Air) and turn it on
- plug in all three cables provided by the 27" Cinema Display (power, DisplayPort, USB)
- close the lid of the MacBook and re-awake it with an external keyboard so the Cinema Display will be the only display in use
- wait a few hours for the Cinema Display to become warm (not sure if this is a necessary condition but it could be)
- then, use the computer under low-light conditions and ensure the brightness is at 5 bars or less
--> You will see the problem.
By the way, the recent Cinema Display firmware update (to address the audio issue) did NOT solve this problem.

How to connect multiple Apple LED Cinema Displays to MacBook Pro

I have an Apple 24 inch LED Cinema display that I run from my MB Pro. I mainly use the MB Pro+ screen for document editing.
I would like to run a second Apple 24 inch Cinema display from the MB Pro. I am presently running another monitor successfully via a Dynalink USB splitter but would really prefer to run a second Apple monitor. I have enquired at two Apple Stores and browsed lots of sites. Multiple monitors from MB Pro seems ok (as long as it's not two Apple monitors). I would be surprised if Apple is content to pass up the opportunity to sell more of these superb screens.
Grateful for any advice and suggestions

In addition to the one from Atlona, there are:
<http://www.gefen.com/gefentv/gtvproduct.jsp?prod_id=9898>
<http://www.kanexlive.com/c247dl>

Problem w/ two 27" LED Cinema Displays on ATI 5770 MacPro

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