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You should also keep MacBook Air and the wireless access point well away from a microwave oven. Microwaves can
jam wireless signals.
Check your range. If you're not getting a signal (or you're getting a weak signal), it could be that MacBook
Air is too far away from the access point. You usually can't get much farther than about 230 feet from an access
point before the signal begins to degrade. Either move closer to the access point or, if it has one, turn on the ac-
cess point's range booster feature. You could also install a wireless range extender.
Update the access point firmware. The access point firmware is the internal program that the access point
uses to perform its various chores. Access point manufacturers frequently update their firmware to fix bugs, so
you should see if an updated version of it is available. See your device documentation to learn how this works.
Reset the router. As a last resort, reset the router to its default factory settings (see the device documenta-
tion to learn how to do this). Note that if you do this you must set up your network from scratch.
Your Sound Isn't Working
Whether you're using the built-in MacBook Air speaker or external speakers connected to MacBook Air's au-
dio output jack, if you're getting no sound, you're getting no joy from applications such as iTunes, QuickTime,
and GarageBand. Here are a few things to try:
Check the sound volume. You'd be surprised how often sound problems are really just a volume issue be-
cause someone has turned the MacBook Air volume down to its lowest level. Check the volume icon in the
menu bar. If you don't see any “waves” coming out of the speaker, click the volume icon. Then click and drag
the slider to turn up the volume. If you don't see the volume icon, open System Preferences, click Sound, and
then click the Output tab, shown in Figure 13.4. Deselect the Mute check box, and then use the Output volume
slider to set the system volume.
Change the output device. If you have multiple sound output devices — say external speakers or Bluetooth
headphones — it's possible that MacBook Air is trying to output the sound to a device that's not currently on or
connected. Open System Preferences, click Sound, and then click the Output tab. In the Select a device for
sound output list (see Figure 13.4), click either Internal Speakers or another device that you know is connected.
 
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