Apple MC240LL User Guide - Page 54

 Wait a few seconds. If the computer doesn't soon start up, shut it down by holding down the power (®) button for about 8 to 10 seconds. Disconnect all external peripherals and try restarting by pressing the power (®) button while holding down the Option key. When your computer starts up, click the hard disk icon, and then click the right arrow. After the computer starts up, open System Preferences and click Startup Disk. Select a local Mac OS X System folder.  If that doesn't work, try using Disk Utility to repair the disk:  Insert the Mac OS X Install DVD into your computer.  Restart your computer and hold down the C key as it starts up.  Choose Installer from the menu bar, and then choose Open Disk Utility. When Disk Utility opens, follow the instructions in the First Aid pane to see if Disk Utility can repair the disk. If using Disk Utility doesn't help, you might need to reinstall your computer's system software. See "Reinstalling the Software That Came with Your MacBook" on page 61. If your MacBook doesn't turn on or start up Try the following suggestions in order until your computer turns on:  Make sure the power adapter is plugged into the computer and into a functioning power outlet. Be sure to use the 60W MagSafe Power Adapter that came with your MacBook. If the power adapter stops charging and you don't see the indicator light on the power adapter turn on when you plug in the power cord, try unplugging and replugging the power cord to reseat it.  If the indicator light on the MagSafe connector is amber, the battery might need to be recharged. Keep the power adapter connected and charge the battery with the computer off. A green light indicates that the battery is fully charged. 54 Chapter 4 Problem, Meet Solution