Apple MacBook (13-inch, Early 2009) - Manual (Page 46)

46 Chapter 4 Problem, Meet Solution
The screen might also darken if you have energy saver features set for the battery.
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 this doesn’t work, restart the computer while holding down 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.
To use Apple Hardware Test:
1 Disconnect all external devices from your computer except the power adapter.
If you have an Ethernet cable connected, disconnect it.
2 Restart your MacBook while holding down the D key.
3 When the Apple Hardware Test chooser screen appears, select the language you want
to use.
4 Press the Return key or click the right arrow button.