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• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
Chapter 4 "Parts listing, Lenovo System x3550 M3 Type 4254 and 7944" on page 403
• See
components are customer replaceable units (CRU) and which components are field replaceable units (FRU).
• If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
Trained service technician.
• Go to the IBM support website at
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 work (the server does not
start).
Note: The power-control
button will not function until
approximately 20 to 40
seconds after the server has
been connected to power.
System x3550 M3Problem Determination and Service Guide
374
http://www.ibm.com/supportportal/
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 service technician only) Reseat the operator information panel
cables, and then repeat steps 1a and 1b.
• (Trained service 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
page
18). 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 service technician only) Reseat the light path diagnostics panel
cable, and then repeat steps 1a and 1b.
• (Trained service technician only) If the server starts, replace the light path
diagnostics 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 power supplies in the server will cause a system error (the
system-error LED on the front panel turns on and the PS and CNFG 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. DIMMs
b. Power supplies
c. (Trained service technician only) Power switch connector
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.
to determine which
to check for technical information, hints,
"System-board switches and jumpers" on
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