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, Types 4255, 7945, and 7949 server,” on page 157 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 3 minutes after
the server has been connected
to power.
1. Make sure Make sure that 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 and the PS and CNFG
LEDs on the operator information panel are lit).
2. Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
v The type of memory that is installed is correct.
v The LEDs on the power supply do not indicate a problem (see
“Power-supply LEDs” on page 69).
v The microprocessors are installed in the correct sequence.
3. 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.
4. 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
5. See “Solving power problems” on page 153.
6. See “Solving undetermined problems” on page 154.
Chapter 3. Diagnostics 55
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