Power Problems - IBM System x3550 M3 Type 4254 Problem Determination And Service Manual

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, System x3550 M3 Types 4254 and 7944," on page 159 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
The power-control button does
not work, and the reset button
does work (the server does not
start).
Note: The power-control button
will not function until
approximately 20 to 40 seconds
after the server has been
connected to power.
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IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
Action
1. Make sure that the power-control button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the operator information panel
cables, and then repeat steps 1a and 1b.
v (Trained service technician only) If the server starts, reseat the operator
information panel. If the problem remains, replace the operator
information panel.
v If the server does not start, bypass the power-control button by using the
force power-on jumper (see "System-board switches and jumpers" on
page 18). If the server starts, reseat the operator information panel. If the
problem remains, replace the operator information panel.
2. Make sure that the reset button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the light path diagnostics panel
cable, and then repeat steps 1a and 1b.
v (Trained service technician only) If the server starts, replace the light path
diagnostics panel.
v If the server does not start, go to step 3.
3. 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 DIMMs are fully seated.
v The LEDs on the power supply do not indicate a problem.
v The microprocessors are installed in the correct sequence.
4. Reseat the following components:
a. DIMMs
b. Power supplies
c. (Trained service technician only) Power switch connector
5. Replace the components listed in step 4 one at a time, in the order shown,
restarting the server each time.
6. If you just installed an optional device, remove it, and restart the server. If the
server now starts, you might have installed more devices than the power supply
supports.
7. See "Power-supply LEDs" on page 110.
8. See "Solving undetermined problems" on page 155.