Hitachi Compute Blade 2000 User Manual page 88

 Detailed front view of the I/O slot expansion unit
Power supply module [0]
Fan module [0]
B
A Power button
Press and hold this button for at least one second to turn on the I/O module
and fan module. If you press and hold this button for 4 seconds or more, the
main power is forcibly powered off.
B POWER LED (PWR)
Lights solid green when the main power to the I/O module is on.
Lights solid orange when the main power to all I/O modules is off.
Blinks orange during initialization when the power is on.
Blinks green during shutdown.
C Error LED (ALM)
Lights solid red when an error occurs in the I/O slot expansion unit.
Lights solid orange during a warning.
D Serial port (SERIAL0/1)
Connects devices that use a serial interface.
Fan module [1] Fan module [2]
C A
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Power supply module [1]
Fan module [3]
D