

1- First download these two kext files:

SleepEnabler.kext.zip

NullCPUPowerManagement (32-/64-bit) 


2- Go to /System/Library/Extensions 


3- Make a backup of AppleIntelCPUPowerMangement.kext and AppleIntelCPUPowerMangementClient.kext and then delete it from this folder


4- Add here the two kext files you've downloaded earlier


5- Open Terminal and do the following:

    cd /System/Library/Extensions

    sudo chown -R root:wheel SleepEnabler.kext

    sudo chmod -R 755 SleepEnabler.kext

    sudo chown -R root:wheel NullCPUPowerManagement.kext

    sudo chmod -R 755 NullCPUPowerManagement.kext


6- Reboot and you're done! 


If the computer doesn't boot, do this:


1. Hold down the option key while powering on

2. Choose [Recovery HD]

3. Open Terminal

4. Do the following:

    cd /Volumes/[volumename]/System/Library/Extensions

    rm -rf SleepEnabler.kext

    rm -rf NullCPUPowerManagement.kext


5- Restart


6- Put AppleIntelCPUPowerMangement.kext and AppleIntelCPUPowerMangementClient.kext back in the /System/Library/Extensions folder 


