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Severe video corruption on dual VGA card MacPro

292 Views 6 Replies Latest reply: Jun 29, 2012 8:45 PM by X423424X RSS
DJ Aurora Calculating status...
Currently Being Moderated
Jun 29, 2012 5:37 PM

I have a Early 2009 MacPro (MacPro 4,1 Quad Core) equipped with two identical 512MB Nvidia Ge Force GT120 video adaptors.  One uses the display port and DVI ports to drive two identical Acer 24" screens.  The second card uses just the DVI port to drive a thrid identical Acer 24" screen.

 

The OS X version is 10.6.8 Snow Leopard with all updates current.

 

Over the last couple of weeks, I've had problems with severe screen corruption with all three screens - so this tells me it's not specifically one card at fault as far as I know.  I've tried removing both cards and swapping their locations, I've rotated and reseated all the RAM chips as well.  No changes.

 

The corruption renders the machine unusable.  Activating the display sleep/screen saver doesn't clear it. 

 

As always, a picture tells a thousands words:

 

https://picasaweb.google.com/lh/photo/DWIMMLfQT7UaV-ywTGmVOBQd7izwLeTAxxO8hOU0cJ Y?feat=directlink

 

Any suggestions on where to start fixing this would be great...

Mac Pro (Early 2009), Mac OS X (10.6.8), 6GB RAM 4 x 1TB HDD
  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)
    Currently Being Moderated
    Jun 29, 2012 7:09 PM (in response to DJ Aurora)

    How's the dust and Heat inside your MacPro?

     

    Have you removed the side door with the power on and checked that the fans are spinning on those cards?

     

    Re: Memory.

     

    Your Mac Pro has Error Correcting Code (ECC) Memory. Simple memory errors are corrected on-the-fly, and uncorrectable errors cause a Hard Stop with a kernel panic.

     

    So do not spend a moment worrying about memory errors causing wierd things to happen in a Mac Pro.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)
    Currently Being Moderated
    Jun 29, 2012 8:18 PM (in response to DJ Aurora)

    Any other high-draw cards in the PCI slots? Could you be running low on Total Power for all PCIe slots?

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • X423424X Level 6 Level 6 (14,190 points)
    Currently Being Moderated
    Jun 29, 2012 8:28 PM (in response to DJ Aurora)

    Why not try one monitor on one card?  Then slowly keep adding the monitors back in and the other card to see what effects these tests have.  Basically different combinations and permutations.

  • X423424X Level 6 Level 6 (14,190 points)
    Currently Being Moderated
    Jun 29, 2012 8:45 PM (in response to DJ Aurora)

    I wasn't suggesting to "really" use it.  Only to see you are getting the same "corruption" in different vidio configurations.  These are just experiments.

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