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, Type 7979 and 1914 server,” on page 79 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 Action
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 20
seconds after the server has
been connected to ac power.
1. 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 LEDs on the power supply do not indicate a problem (see
“Power-supply LEDs” on page 53).
v The microprocessors are installed in the correct sequence.
2.
Make sure that the power-control button and the reset button are working
correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. Reseat the operator information panel cable.
d. Press the power-control button to restart the server. If the button does not
work, replace the operator information panel assembly.
e. Press the reset button to restart the server. If the button does not work,
replace the operator information panel assembly.
3.
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.
4. Reseat the power backplane and restart the server.
5. Replace the power backplane and restart the server.
6. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Hot-swap power supplies
b. (Trained service technician only) System board
7.
See “Solving power problems” on page 74.
8. See “Solving undetermined problems” on page 76.
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the power channel A
LED on the system board is lit.
1. Remove the following components:
v (Trained service technician only) Microprocessor 1
v Fans 4, 6, 8, and 9
2.
Restart the server. If the OVER SPEC and power channel LEDs are still lit, see
the actions for +12 v critical overvoltage fault in “System event/error log
messages” on page 68.
3. Reinstall the components listed in step 1, one at a time, in the order shown,
restarting the server each time. If the power channel A LED is lit, the
component that you just reinstalled is defective. Replace the defective
component.
Chapter 2. Diagnostics 45
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