Power Problems - IBM x3550 - System - 7978 Installation 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 the parts listing in the Problem Determination and Service Guide on the IBM System x Documentation
CD 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 work (the server does not
start).
Note: The power-control button
will not function until 20
seconds after the server has
been connected to ac power.
Action
1. Make sure that the power-control button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. Press the power-control button.
d. If the server does not start, disconnect the server power cords and reseat
the operator information panel cables; then, repeat steps 1a through 1c. If
the problem remains, replace the operator information panel.
2. Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
v The server contains the correct type of DIMMs.
v The DIMMs are correctly seated.
v (Trained service technician only) The microprocessor is correctly installed.
3. If you just installed an optional device, remove it, and restart the server. If the
server now turns on, you might have installed more devices than the power
supply supports.
4. Reseat the following components:
a. DIMMs
b. (Trained service technician only) Power backplane
5. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. DIMMs
b. Power supply
c. (Trained service technician only) Power backplane
d. (Trained service technician only) System board
6. See "Solving undetermined problems" in the Problem Determination and
Service Guide.
Chapter 5. Solving problems
65