Apple MacBook Pro (15-inch, Late 2008) - Manual (Page 56)

56 Chapter 4 Problem, Meet Solution
If the display suddenly goes black or your MacBook Pro freezes
Try restarting your MacBook Pro.
1 Unplug any devices that are connected to your MacBook Pro, except the power
adapter.
2 Press the power (®) button to restart the system.
3 Let the battery charge to at least 10 percent before plugging in any external devices
and resuming your work.
To see how much the battery has charged, click the Battery ( ) status icon in the
menu bar.
The display might also darken if you have energy saver features set for the battery.
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.