IBM IntelliStation Z Pro 6221 Installation Manual page 27

Line-out connector (green)
This connector sends stereo audio signals from the computer to external
devices, such as speakers with built-in amplifiers, headphones, or the audio
line-in jack on a stereo system.
Microphone connector (pink)
This connector is used to connect a microphone to record voice or other
sounds on the hard disk. You can also use this connector (and a
microphone) with speech recognition software.
Power-control button
Press this button to turn the computer on and off manually. You can install a
circular disk, called the power-control button shield, over the power-control
button to prevent accidental manual power-off. This disk is provided with
your computer.
Power-on LED
When this LED is lit and does not flash, it indicates that the computer is
turned on. When this LED is flashing, it indicates that the computer is off
and still connected to an ac power source (standby mode).
System error LED
When this LED is lit, it indicates that a system error has occurred. An LED
on the system board might also be lit to help isolate the error. See
"System-board error LEDs" on page 57 for additional information. Detailed
troubleshooting information is in the User's Guide on the IBM IntelliStation
Documentation CD.
USB ports
Use these automatically configures ports to connect universal serial bus
(USB) v2.0 devices to your computer, using Plug and Play technology.
7
Chapter 1. Introduction