Apple MacBook Pro (13-inch, Mid 2009) - Manual (Page 53)

Chapter 4 Problem, Meet Solution 53
 Check whether the battery needs to be recharged. Press the small button on the left
side of your computer. You should see one to eight lights indicating the battery’s
level of charge. If a single indicator light is on, connect your power adapter to
recharge. For more information about battery indicator lights, see page 54.
 If the problem persists, return the computer to its factory settings by disconnecting
the power adapter 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
is compatible with your computer. See whether removing it and reinstalling the old
memory allows the computer to start up (see page 44).
 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 Pro, see “Learning More, Service, and Support”
on page 61 for information about contacting Apple for service.
If the screen 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, look at the Battery ( ) status icon in the
menu bar.