IBM IntelliStation M Pro 6218 Problem Determination And Service Manual page 21

USB connectors
Use these connectors to connect USB devices to the computer, using
redundant Plug and Play technology.
Microphone connector (pink)
Use this connector to connect a microphone to the computer when you
want to record voices or other sounds on the hard disk. You can also use
this connector (and a microphone) with speech-recognition software.
Line out connector (green)
Use this connector to send audio signals from the computer to external
devices, such as speakers with built-in amplifiers, headphones, multimedia
keyboards, or the audio line-in jack on a stereo system.
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. If the system
board LED is not lit, check the error log.
Hard disk drive activity LED
When this LED is lit, it indicates that the hard disk drive is in use.
Ethernet activity LED
When this LED is lit, it indicates that there is activity between the computer
and the network. There are two of these LEDs, one on the front and one on
the rear of the computer.
Power-on LED
When this LED is lit, it indicates that the computer is turned on.
Power-control button
Press this button to turn the computer on or off.
Ethernet link status LED
When this LED is flickering, it indicates that there is an active connection on
the Ethernet connector. This LED is on the rear of the computer.
5
Chapter 1. Introduction