Power Problems - Lenovo x3550 M4 Installation And Service Manual

Power problems

Use this information to solve 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 technician only)," that step must be performed only by a trained
technician.
v Go to the support website at http://www.ibm.com/supportportal/ 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 5 to 10 seconds
after the server has been
connected to 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. (Trained technician only) Reseat the operator information panel cable, 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, jumpers, and
buttons" on page 29). 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 operator information panel cable, and
then repeat steps 2a and 2b.
v (Trained technician only) If the server starts, replace the operator
information 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 CONFIG
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. Operator information panel connector
b. Power supplies
6. Replace the components listed in step 5 one at a time, in the order shown,
restarting the server each time.
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 137.
9. See "Solving undetermined problems" on page 172.
Chapter 4. Troubleshooting
161