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66 Chapter 5 Troubleshooting
 Make sure you are within antenna range of the other computer or the network’s
access point by checking the AirPort Extreme or AirPort Express signal level. Check
the AirPort status icon in the menu bar. Up to four bars appear to show signal
strength.
Nearby electronic devices or metal structures can interfere with wireless
communication and reduce this range. Repositioning or rotating the computer may
improve reception.
 See AirPort Help (choose Help > Mac Help, then choose Library > AirPort Help from
the menu bar) and the instructions that came with the wireless device for more
information.
If your computer’s hard disk is not recording data correctly
m In a few instances, if the hard disk undergoes unusually strong vibration, the Sudden
Motion Sensor may become active and cause dropped frames or unrecorded portions
of sound or data when the disk is recording intensively. If this occurs, make sure that
your PowerBook is in a stable environment without vibration or abrupt movement.
If you suspect a problem with your computer hardware
m You can use the Apple Hardware Test application to help determine if there is a
problem with one of your computer’s components, such as the memory or processor.
For more information about Apple Hardware Test, see “Using Apple Hardware Test” on
page 68.
If you have problems with your Internet connection
 Make sure your telephone line or network cable is connected and functioning
properly.
 If you are using a dial-up Internet connection, make sure that your telephone cord is
plugged into the modem port (marked with the W icon) and not the Ethernet port
(marked with the G icon) on the computer.
 Open the Network pane of System Preferences and verify the information entered
there with your Internet service provider (ISP) or network administrator.
If you have a problem using your computer or working with the Mac OS
 If the answers to your questions are not in this manual, look in Mac OS Help for
instructions and troubleshooting information.
 Check the Apple Support website at www.apple.com/support for the latest
troubleshooting information and software updates.
LL3092.book Page 66 Friday, February 4, 2005 6:02 PM