Apple MacBook (13-inch, Early 2009) - Manual (Page 45)

Chapter 4 Problem, Meet Solution 45
 Check whether the battery needs to be recharged. Press the small button on the
battery. You should see one to four lights indicating the battery’s level of charge. If a
single indicator light is flashing, allow the power adapter to charge the battery at
least until that indicator light is glowing continuously.
 If the problem persists, reset the MacBook power manager by disconnecting the
power adapter, removing the battery, and holding down the power (®) button for at
least 5 seconds.
 If you recently installed additional memory, make sure that it is correctly installed and
that it is compatible with your computer. See whether removing it and reinstalling
the old memory allows the computer to start up (see page 35).
 Press the power (®) button and immediately hold down the Command (x), Option,
P, and R keys simultaneously until you hear the startup sound a second time. This
resets the parameter RAM (PRAM).
 If you still can’t start up your MacBook, see “Learning More, Service, and Support” on
page 53 for information about contacting Apple for service.
If the screen suddenly goes black or your MacBook freezes
Try restarting your MacBook.
1 Unplug any devices that are connected to your MacBook, 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, look at the Battery ( ) status icon in the
menu bar.