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Mac Pro / 30" Cinema Display Flickering

1210 Views 11 Replies Latest reply: Oct 8, 2013 9:20 AM by gherth RSS
trenchestrenches Calculating status...
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May 9, 2013 1:45 PM

The studio where I work recently purchased a new Mac Pro, and since then, the 30" Cinema Display occasionally flickers. Sometimes very fast, sometimes not at all, sometimes once an hour, without any rhyme or reason. We switched out the display with another 30" and have the same problem. The tower is in a machine closet down the hall, and we use a long series of powered extenders to reach the display in the studio. This system has been in place for many years.

 

Here's a video of a particularly bad session:

 

http://client.eargoo.com/IMG_0454.MOV

 

Any thoughts? I would love to get to the bottom of this!

Mac Pro, Mac OS X (10.7.5)
  • The hatter Level 9 Level 9 (58,590 points)
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    May 9, 2013 3:19 PM (in response to trenchestrenches)

    video card, model, and limits on dvi extenders come to mind as well as temp in closet

  • Grant Bennet-Alder Level 8 Level 8 (48,135 points)
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    May 10, 2013 9:05 AM (in response to trenchestrenches)

    The most likely failure is the graphics card, even if it has been working fine forever.

     

    You should seriously consider a newer graphics card. The Apple-firmware 5770 (about US$250) works in ALL model Mac Pros for everything except possibly minor issues with copy-protected movies.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • Grant Bennet-Alder Level 8 Level 8 (48,135 points)
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    May 10, 2013 9:31 AM (in response to trenchestrenches)

    Is this coming directly off the DVI port, or using an adapter?

     

    Mini DisplayPort with an adapter is power-limited, and you should be using an ACTIVE adapter that has signal re-drivers.

     

    For a 30" display (which has a resolution above 1920 wide) you will need Dual-Link DVI all the way through: all cables, adapters and everything must be Dual-Link DVI (and all pins in the grid must be present).

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • The hatter Level 9 Level 9 (58,590 points)
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    May 10, 2013 9:46 AM (in response to trenchestrenches)

    You realize there are no Thunderbolt ports, only MiniDisplay.

    Only iMac and MacBooks have Thunderbolt.

    And not all dual link adapters are the same.

     

    http://support.apple.com/kb/HT5219

     

     

    Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)

    http://support.apple.com/kb/HT3382

    Guide to Apple graphic display adapters needed

    https://support.apple.com/kb/HT3235

    Atlona (Dual Link) DVI to Mini DisplayPort Converter for Apple 27-inch LED and 27-inch iMac

    http://www.atlona.com/Atlona-Dual-Link-DVI-to-Mini-DisplayPort-Converter-USB-Pow ered.html

  • Grant Bennet-Alder Level 8 Level 8 (48,135 points)
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    May 10, 2013 10:08 AM (in response to trenchestrenches)

    Are any DVI extenders you are using rated for Dual-Link DVI? They require that three extra pairs of conductors be present (the three push-pull data lines are doubled) to support faster-than 1920-wide data.

     

    If you drop the resolution to 1920-wide and it perks up, Dual-Link is likley the issue.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • gherth Calculating status...
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    Oct 8, 2013 9:20 AM (in response to trenchestrenches)

    I am on my third Mac Pro since last year and have the same issue with each system.  The first two Mac Pro's were mid 2010, and the last one is 2012.  All have the Radeon HD 5770 standard graphics card attatched to a 2005 Apple 30" HD Cinema Display, no adapters, all original cables.  Display flickers intermittently upon power up; only fix is to shut down and power up again.  Apple refuses to admit that there is an issue with this graphics card.  I have never had this issue with a 2005 Mac Pro attached to the 30" display.

     

    Just got off the support line with Apple;  need to take tranqualizers, very infuriating.  First question after I tell them this is my THIRD computer with the same issue;  Are you sure the cable is connected correctly?

     

    First level ******** buffer sent me to 'senior level tech support' with ne better result.  Two choices: take it in to the Apple Store whose employees broke in to my administrator acount on Mac Pro number 2, or refer to engineering and possibly have a 'third party' tech come to my location and replace graphics card if engineering approves.

     

    It is my own fault for using products made in china.  What else should I expect!

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