Apple iMac (Early 2009) - Manual (Page 47)

Chapter 4 Problem, Meet Solution 47
 Check the AirPort (Z) status menu in the menu bar. Up to four bars appear,
indicating signal strength. If the signal strength is weak, try changing your location.
 See AirPort Help (choose Help > Mac Help, and then choose Library > AirPort Help
from the menu bar). Also see the instructions that came with the wireless device for
more information.
Keeping Your Software Up to Date
You can connect to the Internet and automatically download and install the latest free
software versions, drivers, and other enhancements from Apple.
When you are connected to the Internet, Software Update checks to see if any updates
are available for your computer. You can set your iMac to check for updates
periodically, and then you can download and install updated software.
To check for updated software:
1 Choose Apple () > System Preferences.
2 Click the Software Update icon and follow the onscreen instructions.
 For more information, search for “Software Update” in Mac Help.
 For the latest information about Mac OS X, go to www.apple.com/macosx.
When an Application Doesn’t Respond
On rare occasion, an application may “freeze.” Mac OS X provides a way to quit an
application that’s not responding, without restarting your iMac. Quitting a frozen
application may allow you to save your work in other open applications.