Power problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 4, “Parts listing, Type 7377 server,” on page 125 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technical
information, hints, tips, and new device drivers or to submit a request for information.
Symptom Action
The power-control button does
not work, and the reset button
does not work (the server does
not start).
Note: The power-control button
will not function until
approximately 40 seconds after
the server has been connected
to power.
1. Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
v The LEDs on the power supply do not indicate a problem (see
“Power-supply LEDs” on page 58).
v Both power supplies installed in the server are of the same type. Mixing
different power supplies in the server will cause a system error (the
system-error LED on the front panel turns on).
v The type of memory that is installed is correct.
v The microprocessors are installed in the correct sequence.
v The fan power cable is correctly connected to the fan board and the
power-supply paddle card.
2. Make sure that the power-control button and the reset button are working
correctly:
a. Disconnect the server power cords.
b. Reseat the operator information panel assembly cable.
c. Reconnect the power cords.
d. Press the power-control button to restart the server. If the button does not
work, replace the operator information panel assembly.
e. Press the reset button (on the light path diagnostics panel) to restart the
server. If the button does not work, replace the operator information panel
assembly.
3. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Hot-swap power supplies
b. (Trained service technician only) System board
The server does not turn off.
1. Turn off the server by pressing the power-control button for 5 seconds.
2. Restart the server.
3. If the server fails POST and the power-control button does not work, disconnect
the power cord for 20 seconds; then, reconnect the power cord and restart the
server.
4. If the problem remains, suspect the system board.
The server unexpectedly shuts
down, and the LEDs on the
operator information panel are
not lit.
See “Solving undetermined problems” on page 121.
Chapter 3. Diagnostics 51
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