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iMac (Late 2009): Using the correct Mac OS X system software

Symptoms

You may notice that iMac (21.5-inch, Late 2009), iMac (27-inch, Late 2009), and iMac (27-inch, Quad Core, Late 2009) computers sometimes exhibit symptoms that indicate the wrong Mac OS X system software is installed.  These symptoms can include:

  • Graphic anomalies such as visual corruption on startup or corruption that appears to follow the mouse pointer.
  • The computer may report that AirPort or Bluetooth isn't currently available.
  • The Mouse System Preference pane does not display the Magic Mouse or does not utilize some of the functionality that it supports.
  • Brief graphic distortion when powering down the iMac.

You may also observe other anomalies which are indicative of having the wrong Mac OS X system software installed on iMac (21.5-inch, Late 2009), iMac (27-inch, Late 2009), and iMac (27-inch, Quad Core, Late 2009) computers.

Resolution

The iMac (21.5-inch, Late 2009) and iMac (27-inch, Late 2009) computers originally shipped with Mac OS X v10.6.1 (Build 10A2155). The DVD used to restore this version of Mac OS X for iMac (21.5-inch, Late 2009) and iMac (27-inch, Late 2009) computers is included in the box and is the only system software that you should use if re-installation is necessary.

The iMac (27-inch, Quad Core, Late 2009) computer originally shipped with Mac OS X v10.6.2 (Build 10C2234).  The DVD used to restore this version of Mac OS X for the Mac (27-inch, Quad Core, Late 2009) computer is included in the box and is the only system software that you should use if re-installation is necessary.  iMac (21.5-inch, Late 2009),  iMac (27-inch, Late 2009), and iMac (27-inch, Quad Core, Late 2009) computers that shipped after the release of Mac OS X v10.6.2 include Mac OS X v10.6.2 (Build 10C2234) restore DVDs in the box.  It's important to use the DVD media that was included with your iMac.  

Do not attempt to use a Mac OS X v10.6.0 Snow Leopard retail DVD.  Do not use DVDs that have earlier versions of the Mac OS X operating system.

Additional Information

Learn more about the Mac OS X versions (builds) included with your Intel-based Mac.

To find your build number:

  1. Choose About this Mac from the Apple () menu in the upper left menu bar.
  2. Click on version number direction below the text "Mac OS X" to reveal the build number.

Note: Later versions of Mac OS X system software may potentially change the build number to something different than 10A2155. This is correct behavior.  However, it's important to note that the bundled DVD restore media that is included with iMac (21.5-inch, Late 2009), iMac (27-inch, Late 2009), and iMac (27-inch, Quad Core, Late 2009) computers must be used before running Software Update. 

Last Modified: Sep 7, 2011
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  • Last Modified: Sep 7, 2011
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