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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 See Chapter 3, "Parts listing, xSeries 100 Type 8486," on page 49 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
The power-control button does
not work, and the reset button,
if supported, does work (the
server does not start).
Note: The power-control button
will not function until 20
seconds after the server has
been connected to ac power.
The server does not turn off.
The server unexpectedly shuts
down, and the LEDs on the
power switch/LED bracket are
not lit.
34
IBM xSeries 100 Type 8486: Problem Determination and Service Guide
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 power switch/LED bracket
cable, and then repeat steps 1a and 1b.
v (Trained service technician only) If the server starts, reseat the power
switch/LED bracket cable. If the problem remains, replace the power
switch/LED bracket.
v If the server does not start, bypass the power-control button by using the
force power-on jumper (see "System-board jumpers" on page 11); if the
server starts, reseat the power switch/LED bracket cable. If the problem
remains, replace the power switch/LED bracket.
2. 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 power-supply error LED is not lit.
v The microprocessor is installed correctly.
3. (Trained service technician only) Replace the system board.
4. If you just installed an optional device, remove it, and restart the server. If the
server now turns on, you might have installed more devices than the power
supply supports.
5. See "Solving undetermined problems" on page 47.
1. Determine whether you are using an Advanced Configuration and Power
Management (ACPI) or a non-ACPI operating system. If you are using a
non-ACPI operating system, complete the following steps:
a. Press Ctrl+Alt+Delete.
b. Turn off the server by holding the power-control button for 5 seconds.
c. Restart the server.
d. If the server fails POST and the power-control button does not work,
disconnect the ac power cord for 20 seconds; then, reconnect the ac power
cord and restart the server.
2. If the problem remains or if you are using an ACPI-aware operating system,
suspect the system board.
See "Solving undetermined problems" on page 47.
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