I have the latest Mac Pro using it as a server with no monitor (headless). This thing goes to sleep and the Energy Saver System Preference has only one slider for Turn Display off after 1min - Never. I have selected Never and check marked Prevent computer from sleeping automatically when the display is off, but there is no display, so it just goes to sleep. Anyone have a solution to get the other slider back so this computer does not go to sleep? Another thread suggested the solution below but the Your-Mac-Model.plist has a lot of files in it and no way of knowing which file is for my Mac. Anyone know which file I should use? edit "/S/L/E/IOPlatformPluginFamily.kext/Contents/PlugIns/X86PlatformPlugin.kext/Contents/Resources/Your-Mac-Model.plist find: <key>UnifiedSleepSliderPref</key> <true/> replace: <key>UnifiedSleepSliderPref</key> <false/> rebuild kext cache and reboot.