HP (Hewlett-Packard) D3J88UT#ABA ユーザーズマニュアル

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HP Z420 Workstation front panel 
Figure 1-11
  Front panel components
Table 1-9
  Component descriptions
1
 Optical 
drive
5
USB 3.0 ports (2, blue)
2
Power button
6
Headphone connector
3
Hard drive activity light
7
Microphone connector
4
USB 2.0 port (black)
8
IEEE–1394a connector
16
Chapter 1   Hardware overview