Tag archives: mac

Get Back the System Sleep Preferences in Mac OS X

I recently purchased a Mac Pro (late 2013) and discovered that the Energy Saver Pane is a little different; most notably, the Computer Sleep slider is missing. Here is how to get it back.

First, use the following terminal commands to determine the model and board ID of your computer:

sysctl hw.model | awk '{ print $2 }'
ioreg -l | awk -F\" '/board-id/ { print $4 }'

Second, navigate to the following folder:

cd /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/X86PlatformPlugin.kext/Contents/Resources/

Third, determine the .plist file that corresponds to the model and board ID of your computer; e.g., Mac-F60DEB81FF30ACF6.plist.

Fourth, modify the file that corresponds to the model and board ID of your computer:

sudo vi /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/X86PlatformPlugin.kext/Contents/Resources/Mac-UDID.plist

Fifth, change the following line:




Sixth, regenerate kext cache by “touching” the Extensions directory:

sudo touch /System/Library/Extensions

Finally, wait a minute just to make sure the system has enough time to finish regenerating the kext cache. Then, reboot your mac.

Alas, you will once again have the two-slider pane.

System Energy Dual Preferences

How To Downgrade from Mac OS X 10.6.7 to 10.6.6

Snow Leopard Install Screen

  1. While OS X is running, insert your OS X Snow Leopard Install DVD.
  2. Double click Install Mac OS X.
  3. Keep the DVD inside your computer while you wait for it to restart.
  4. Wait until the second phase of the installation procedure completes.
  5. You are now downgraded to OS X 10.6.2 (or something less than 10.6.6).
  6. Download and apply the OS X 10.6.6. combo update to bring you back to 10.6.6.