Dell Precision 1G155 Setup And Quick Reference Manual page 20

NOTE: Do not attempt to
operate a PS/2 mouse and
a USB mouse
simultaneously.
20
Setup and Quick Re ference Guide
1
Keyboard and Mouse
Connect the keyboard and mouse as shown. Do not connect a USB mouse
or keyboard to the USB connectors on the front of the computer.
headphone/speaker
connector
USB connectors (2)