After upgrading from Mac OS X Mavericks 10.9.2 to 10.9.3, my machine (HP Probook 4530s) ran into AppleIntelCPUPowerManangement Kernel panic, and to my surprise none of the boot flags helped me to boot into the system. I decided to do a fresh install, but even booting from USB resulted the same. Then I decided to remove AppleIntelCPUPowerManangement.kext, but I can't even access terminal. Here's the solution: My machine dual boots Windows and Mac. I logged into Windows Installed MacDrive , trial version Rebooted into windows and opened the drive on which Mac is installed Did two things, don't know which one helped: Opened /Extra/org.chameleon.Boot.plist with a text editor and added the following code: <key>GenerateCStates</key> <string>No</string> <key>GeneratePStates</key> <string>No</string> And deleted AppleIntelCPUPowerManangement related kexts from this directory: /System/Library/Extensions/ ...