Lenovo System x3550 M4 Installation And Service Manual page 163

• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
• Go to the support website at http://www.lenovo.com/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 5 to 10 seconds
after the server has been
connected to power.
The OVER SPEC LED on the
light path diagnostics panel
is lit, or the Pwr rail 1 error
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 a. on page 149 and b. on page 149.
• (Trained technician only) If the server starts, reseat the operator information
panel. If the problem remains, replace the operator information panel.
• 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 27). 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 a. on page 149 and b. on page 149.
• (Trained technician only) If the server starts, replace the operator
information panel.
• If the server does not start, go to 3 on page 149.
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:
• The power cords are correctly connected to the server and to a working
electrical outlet.
• The type of memory that is installed is correct.
• The DIMMs are fully seated.
• The LEDs on the power supply do not indicate a problem.
• 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 5 on page 149 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 129.
9. See "Solving undetermined problems" on page 158.
1. Disconnect the server power cords.
2. (Trained technician only) remove microprocessor 1 if the Pwr rail 1 error has
been recorded in the IMM event log.
.
Chapter 4 Troubleshooting
149