HP L6015tm User Manual page 22

4. Connect the audio cable between the PC audio out port and the monitor audio in port.
NOTE:
Figure 2-24
5. Connect the USB upstream cable between the PC and the monitor.
NOTE:
Figure 2-25
16 Chapter 2 Setting Up the Monitor
The audio cable is required for the monitor speakers to function.
Connecting the Audio Cable
The USB cable is required for optional USB modules and touch screen operation.
Connecting the USB Cable