Lenovo System x3550 M5 Installation And Service Manual page 95

Table 18. Power problems and actions
• 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 Web site 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 20 seconds after
the server has been connected
to power.
Pwr rail 1 error has been
recorded in the system event
log.
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.
• (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 2a and 2b.
• (Trained technician only) If the server starts, replace the operator
information panel.
• 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 ratings of power supplies in the server will cause a system error
(CONFIG icon will be shown on the LCD system information display panel).
4. Make sure that:
• The power source meets the minimum voltage requirement for the installed
power supplies.
• 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 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 60.
9. See "Solving undetermined problems" on page 89.
1. Disconnect the server power cords.
2. (Trained technician only) remove microprocessor 1 if the Pwr rail 1 error has
been recorded in the system event log.
.
Chapter 3 Troubleshooting
81