1 Reply Latest reply: Nov 13, 2013 7:19 AM by sterling r
diegotrystero Level 1 (10 points)

Hello, immediately after the installation of Mavericks in my MacPro 2x2.26 GHz Quad-Core I noticed many troubles in the second monitor, an Acer V223HQ.

I had to remove the Dock and Toolbar in the second monitor because the palettes of Photoshop did not stay in their place, I always had to move them in the right position. But even eliminating Dock bar and I continue to have problems, the resolution of the monitor, 1920x1080, suddenly changes and becomes 1440x900 so the palettes get bigger and change position.

Right resolution: http://imageshack.us/a/img203/1583/6pcc.jpg

Wrong resolution: http://imageshack.us/a/img585/4189/jubp.jpg

The only way to return to the right monitor resolution is to unplug the cable from the VGA-miniDVDs adapter and then plug again.

This almost happened three or four times a day, at random, with both Photoshop with Cinema4D, and it is very annoying.

The main monitor is a LaCie 324 and I had no trobubles with this one.

MacPro 2x2.26
  • sterling r Community Specialists

    Howdy diegotrystero,


    It sounds like your secondary displays resolution is changing from its recommended, down to 1440x900 without rhyme or reason. I wanted to recommend the steps from this troubleshooting article named:

    Apple computers: Troubleshooting issues with video on internal or external displays


    1. Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
    2. Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
    3. Try unplugging the video adapter or cable and then plug it back in.
    4. If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
      • Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
    5. If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).

    Reset the systemYou can reset the Mac's parameter RAM and SMC.Reset the resolutionStart by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:

    1. Start up in Safe Mode.
    2. From the Apple () menu, choose System Preferences.
    3. Choose Displays from the View menu to open the preferences pane.
    4. Select any resolution and refresh rate that your display supports.
    5. Restart your computer.


    Thank you for using Apple Support Communities.

    All the very best,