Power Problems - IBM X3950 X5 Problem Determination And Service Manual

Power problems

This topic provides possible solutions to problems with the power or power button
on the server.
About this task
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 7145, 7146, 7143, and 7191," on page 81 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.
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 for up to 3
minutes after the server has
been connected to ac power.
Action
1. Check the light path to determine whether any LEDs are lit. If they are, follow
the instructions for correcting light path errors (see "Light path diagnostics
LEDs" on page 63).
2. Make sure that the operator information panel power-control button is
working correctly:
a. Disconnect the ac power cord for 20 seconds; then, reconnect the ac power
cord and restart the server.
b. Reseat the operator information panel cables, and then repeat step a.
v If the server starts, reseat the operator information panel (see "Removing
the operator information panel assembly" on page 118 and "Replacing
the operator information panel assembly" on page 120). If the problem
remains, replace the operator information panel.
v If the server does not start, reseat the operator information panel. If the
problem remains, replace the operator information panel.
3. Make sure that the reset button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. Reseat the light path diagnostics panel cable (the operator information
panel ribbon cable), and then repeat steps a and b.
v If the server starts, replace the operator information panel (see
"Removing the operator information panel assembly" on page 118 and
"Replacing the operator information panel assembly" on page 120).
v If the server does not start, go to step a and b.
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 memory card is fully seated.
v The LEDs on the power supply do not indicate a problem.
v The microprocessors are installed in the correct sequence.
v The firmware levels in the server and the memory expansion module are all
the same.
v The microprocessor types in the server and the memory expansion module
are all the same.
(Continued on the next page)
53
Chapter 3. Diagnostics