HP LaserJet M1120 Multifunction Printer - Manual (Page 118)

When connected with a USB cable, the product does not appear in the Macintosh Printer Setup Utility after the driver is selected.
Cause Solution
from the chain and connect the cable directly to the USB port on
the host computer.
NOTE: The iMac keyboard is a nonpowered USB hub.
Table 11-1 Problems with Mac OS X v10.3 and Mac OS X v10.4 (continued)
108 Chapter 11 Problem solve ENWW