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Can no longer get native resolution on monitor

507 Views 7 Replies Latest reply: May 20, 2012 5:33 PM by Grant Bennet-Alder RSS
flashvenom Calculating status...
Currently Being Moderated
May 2, 2012 6:50 PM

For the better part of a year I had two twin Viewsonic monitors set at 1440x900 with my Mac Pro (late 2011) Radeon 5770. One plugged right into the DVI, then another with an Apple Mini-DP to VGA adapter. Everything was fine, and I'm not sure what changed, but now, suddenly, I cannot find the correct resolution in Displays, and it is simply displayed as "VGA Display" and the display is blurry. I have reset the PRAM, reset the settings on the monitor, repaired disk permissions, thrown away some system prefs files I found via Google, and plugged cables in every possible combination (as I have a myriad of such cables), I even have a secondary Mini-Displayport to VGA adapter. All signs point to software. I have the latest update of Mac OS X Lion.  I have even tried SwitchResX to no avail, but to be honest, I didn't spend the hours of time it would take to study monitor technology, refresh rates, hsync, vsync, etc etc...


Can anyone help with a suggestion, I'm going bannanas over here... I have Applecare but I'm sure they'll just tell me fresh to reinstall Mac OS X. (Hrmm sounds like Windows.. Oh yeah, that reminds me... in Bootcamp the monitors work fine.)

Mac Pro, Mac OS X (10.6.8)
  • X423424X Level 6 Level 6 (14,190 points)
    Currently Being Moderated
    May 2, 2012 7:41 PM (in response to flashvenom)

    Did you try clicking Detect Displays in the Displays prefernces?  How about a smc reset?

  • The hatter Level 9 Level 9 (58,535 points)
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    May 3, 2012 10:27 AM (in response to flashvenom)

    unplug w/o pressing power button (and unplug all cables and devices) does not an SMC Reset make

  • The hatter Level 9 Level 9 (58,535 points)
    Currently Being Moderated
    May 3, 2012 4:28 PM (in response to flashvenom)

    there have been at least 4 versions how to reset smc and that for mac pro, then tips on G4 MDD and G5


    press oower while unplugged works, and isto drain and clear any power


    use to do so with ram removed also and remove pram battery

  • Grant Bennet-Alder Level 8 Level 8 (48,095 points)
    Currently Being Moderated
    May 20, 2012 5:33 PM (in response to flashvenom)

    it is simply displayed as "VGA Display"

    That is how your Display Identified itself to Mac OS X. If the display only provides that as a name, and does not provide its full capabilities, Mac OS X cannot determine its true capabilities and you get an abbreviated set of resolutions to avoid damaging your display.


    As you discovered, you can use a cheater program like SwitchResX.


    There is nothing wrong with your Mac. That is the way it was designed.


    There is nothing wrong with these Forums, either. They have always been User-to-User forums, and Apple never posts here. If you want Apple to help, you need to take your equipment to an Apple Store (free evaluation) or call AppleCare and pay their charges (which they may waive later for certain problems) if you are out of your free phone support period.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers


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