Power Problems - IBM System x3650 M4 Type 7915 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 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 website 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 not 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.
The power-control button does
not work, and the reset button
does not work (the server does
not start).
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 technician only) Reseat the operator information panel cables, and
then repeat steps 1a and 1b.
v (Trained 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 19). 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 technician only) Reseat the light path diagnostics panel cable, and
then repeat steps 1a and 1b.
v (Trained 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 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).
4. 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.
5. Reseat the following components:
a. DIMMs
b. Power supplies
c. (Trained technician only) Power switch connector
6. Replace the components listed in step 5 one at a time, in the order shown,
restarting the server each time.
(Continued on the next page)
7. 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.
8. See "Power-supply LEDs" on page 135.
9. See "Solving undetermined problems" on page 177.
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Chapter 3. Diagnostics