IBM IntelliStation M Pro 9229 Installation Manual page 22

IEEE 1394 (FireWire) connectors
USB connectors
Microphone connector (pink)
Line out connector (green)
Hard disk drive activity LED
System-error LED
Ethernet activity LED
Power-on LED
Power-control button
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IBM IntelliStation M Pro Type 9229: Installation Guide
Use these connectors (four-pin on the front and six-pin on the rear) to
connect FireWire devices, such as a digital video camera or an external
hard disk drive.
Use these connectors to connect USB devices to the computer, using
redundant Plug and Play technology.
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.
Use this connector to send audio signals from the computer to external
devices, such as speakers with built-in amplifiers, headphones, a
multimedia keyboard, or the audio line-in jack on a stereo system.
When this LED is lit, it indicates that the hard disk drive is in use.
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 LED on
the system board is not lit, check the error log.
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.
When this LED is lit, it indicates that the computer is turned on.
Press this button to turn the computer on or off.