Apple Z0D5 User Guide - Page 55

If the screen suddenly goes black or your MacBook freezes

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ÂÂ 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 46). ÂÂ 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). ÂÂ If you still can't start up your MacBook, see "Learning More, Service, and Support" on page 66 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. The screen might also darken if you have energy saver features set for the battery. If an audio device plugged into the audio port isn't working Unplug the audio device. Choose Apple () > System Preferences, and open Sound preferences. In the Input pane, specify whether you want the port to be used for Sound Input or Sound Output. Plug the audio device back in. Note: If you're running Windows on your MacBook, the port supports only audio output. Chapter 4 Problem, Meet Solution 55

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55
Chapter 4
Problem, Meet Solution
Â
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 46).
Â
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).
Â
If you still can’t start up your MacBook, see “Learning More, Service, and Support” on
page 66 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.
The screen might also darken if you have energy saver features set for the battery.
If an audio device plugged into the audio port isn’t working
Unplug the audio device. Choose Apple (
) > System Preferences, and open Sound
preferences. In the Input pane, specify whether you want the port to be used for Sound
Input or Sound Output. Plug the audio device back in.
Note:
If you’re running Windows on your MacBook, the port supports only audio output.