IBM H SERIES RS/6000 - Manual (Page 24)

Reading the Operator Panel Display
The operator panel display is used to:
Track the progress of the system unit self tests and configuration program.
Display codes when the operating system comes to an abnormal end.
Display system messages.
1
4
3
2
During power on self test (POST), four characters display indicating the progress of
the testing. If an error is detected that requires attention, the system unit halts and
an eight digit number displays in the operator panel display to identify the error.
1 Reset Button 3 Operator Panel Display
2 Power On Button 4 Power On LED
2-4 RS/6000 Enterprise Server Model H Series User's Guide