Mac OS X: Do Not Connect USB Printer to Apple Pro Keyboard

For best results, connect your USB printer directly to your computer, or to a compatible USB hub instead of to the Apple Pro Keyboard.
Symptom

Connecting a printer to the built-in USB port of an Apple Pro Keyboard may generate an alert message or result in the printer not working correctly.


Solution

Unplug the printer from the keyboard, and connect it to one of the computer's USB ports or a compatible USB hub.

For related information, see technical document 106714, "Mac OS X: How to Troubleshoot Printing Issues".
Published Date: Feb 20, 2012