Chapter 4 Problem, Meet Solution 49
3Insert the batteries with the positive ends facing up, as shown above.
4Replace the cover and turn on your mouse.
You may have to click your Apple Magic Mouse once to reconnect it to your iMac.
To check the battery status, slide the On/off (®) switch to turn on the mouse. If the
indicator light doesn’t glow, you may need to change the batteries. You can check the
battery level in Mouse Preferences. Choose Apple () > System Preferences and click
Mouse. The battery level is in the lower-left corner.
Using Apple Hardware Test If you suspect a problem with your iMac hardware, use the Apple Hardware Test
application to help determine if there’s a problem with one of the computer’s
components, such as the memory or processor.
To use Apple Hardware Test:
1Disconnect all external devices from your iMac, except a USB keyboard and mouse,
if you use them. If you have an Ethernet cable connected, disconnect it.
2Restart your iMac while holding down the D key.
3When the Apple Hardware Test language chooser screen appears, select the language
you want to use.
4Press the Return key or click the right arrow button.
5When the Apple Hardware Test main screen appears (after about 45 seconds), follow
the onscreen instructions.