Power Problems - Lenovo x3650 M4 BD 5466 Installation And Service Manual

Power problems

• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• See Chapter 5 "Parts listing" on page 141 to check if a component is a consumable, structural, or FRU part.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
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
approximately 1 to 3 minutes
after the server has been
connected to ac power.
The server does not start.
The server does not start.
(Continued)
Action
1. Make sure that the top cover is closed and latched correctly.
2. Make sure that the top cover/power cut-off switch cable is seated correctly.
3. Make sure that the power-control button on the server is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. Reseat the operator information panel cables, and then repeat steps 3a
and 3b.
• If the server starts, reseat the operator information panel. If the problem
remains, replace the operator information panel.
4. Make sure that the reset button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. Reseat the operator information panel cable, and then repeat steps 3a
and 3b.
• If the server starts, replace the operator information panel.
• If the server does not start, go to step 5.
5. 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.
6. Reseat the following components:
a. DIMMs
b. Power supplies
7. Replace the components listed in step 6 one at a time, in the order shown,
restarting the server each time.
8. 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.
9. See "Power-supply LEDs" on page 17.
10. See "Solving undetermined problems" on page 135.
1. Check the power LED on the system board. See "System-board LEDs" on
page 27 for the LED location.
2. Reseat the power supply.
3. Replace the power supply.
.
Chapter 4 Troubleshooting
131