Apple MacBook (13-inch, Aluminum, Late 2008) - Manual (Page 56)

56 Chapter 4 Problem, Meet Solution
If you press the battery button, and all battery indicator lights flash five times
quickly
Your battery needs to be replaced. Contact an Apple Retail Store or an Apple
Authorized Service Provider (AASP).
If you press the battery button, and the battery indicator lights flash from left to
right and then from right to left, five times in a row
Your battery is not recognized. Check that your battery is installed properly in your
computer.
If you forget your password
You can reset your administrator password and passwords for all other accounts.
1 Insert the Mac OS X Install DVD. Then restart your computer and hold down the C key as
it starts up.
2 Choose Utilities > Reset Password from the menu bar. Follow the onscreen instructions.
If you have trouble ejecting a disc
Quit any applications that might be using the disc and try again. If that doesn’t work,
restart the computer and then immediately press and hold the trackpad button.
Using Apple Hardware Test
If you suspect a problem with the MacBook hardware, you can use the Apple Hardware
Test application to help determine if there is a problem with one of the computer’s
components, such as the memory or processor.