16 Chapter 1
m Make sure all devices are turned on and ready to use.
m If you are connected to an Ethernet network, check the settings in the AppleTalk control
panel to make sure that Ethernet is selected. Your computer may not start up because of
heavy network traffic. Disconnect the Ethernet cable, then start up again. Reconnect the
Ethernet cable after the computer starts up. (It’s okay to connect and disconnect an
Ethernet cable while your computer is on.)
For USB devices:
If you’re still having problems with one or more USB devices, do the following:
m Plug the device into another USB port on your computer or into the USB port on another
device that is plugged into a power outlet (such as a self-powered hub).
m If the device is connected to a hub, try unplugging one or more devices from the hub.
m If the device is connected to a self-powered hub (a hub that has a power cord), make sure
the cord is plugged into a working electrical outlet.
m Unplug all USB devices from your computer except the Apple USB keyboard and Apple
USB mouse. Plug one device in at a time to determine which device is the problem. Once
you determine which device is causing the problem:
m There may be something wrong with the cable connecting the device. If possible,
borrow a cable that you know works with another similar device. Connect the cable to
the device, then connect the device to your computer. Start up your computer. If the
device works using the borrowed cable, then you need to replace the cable. Contact
the device manufacturer or an Apple-authorized service provider.
m Refer to the documentation that came with the device. Also see the information on
connecting equipment in the online documentation that came with your computer.
m If you suspect a mouse problem, clean your Apple USB mouse as described in the online
documentation that came with your computer. Then, plug the mouse into an open USB
port on your computer. If the mouse works, then you may have a problem with the
keyboard. If the mouse doesn’t work, borrow an Apple USB mouse from another
computer and connect it to yours. If that solves the problem, you may need to repair your
mouse. Consult an Apple-authorized service provider.
m If you suspect a keyboard problem, borrow an Apple USB keyboard from another
computer and connect it to yours. If that solves the problem, you may need to repair your
keyboard. Consult an Apple-authorized service provider.
For non-USB devices:
If you’re still having problems with one or more non-USB devices, do the following:
m Shut down your computer by pressing the Power button (®) on your Apple USB
keyboard or on the front of the computer. When a dialog box appears, click Shut Down.
Reconnect all external devices and turn them on. Then restart your computer.
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