This is a short and sweet how-to on how to boot into safe mode. It saved be a LOT of downtime recently, when I installed a program that caused some serious errors. I booted into safe mode, uninstalled, and it was fixed! 1. Shut down completely 2. Press the power button 3. Wait for the startup chime 4. Immediately after (not before) the startup chime, press and hold the shift key. Do this until the grey apple loading screen shows up. 5. Wait while safe mode boots up. It will take a lot longer than regular OS X. 6. Log in (press shift-enter instead of enter after putting in your password to log in without login items.) 7. You are in safe mode Safe mode will run disk repair, and ignores the cache of kernel extensions The regular GUI is used in safe mode by default Related Apple help files: Booting into Safe Mode: http://docs.info.apple.com/article.html?artnum=107393 Safe Mode takes longer than regular startup: http://docs.info.apple.com/article.html?artnum=107394 If there are any errors in this tutorial, please post the correction(s), and I will add them.