When connected with a USB cable, the product does not appear in
the Print & Fax list after the driver is selected.
Make sure that your Mac operating system is Mac OS X 10.5 or later.
Make sure that the product is turned on.
Make sure that the USB cable is connected correctly.
Make sure that you are using the appropriate high-speed USB cable.
Make sure that you do not have too many USB devices drawing power from the chain. Disconnect
all of the devices from the chain, and connect the cable directly to the USB port on the computer
Check to see if more than two non-powered USB hubs are connected in a row on the chain.
Disconnect all of the devices from the chain, and then connect the cable directly to the USB port
on the computer.
The iMac keyboard is a non-powered USB hub.