v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Problem Determination and Service Guide on the IBM System x Documentation
CD 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 server does not start. Check the four 12-volt power LEDs (A, B, C, and D) on the system board. See the
Problem Determination and Service Guide for the LED locations.
1. If the Channel A power LED is lit, check components in the following order.
a. Remove all PCI adapters and riser cards. Try restarting the server. If the
server starts, reinstall the PCI adapters and riser cards, one at a time, to
isolate the defective adapter.
b. (Trained service technician only) System board
c. (Trained service technician only) Power backplane
2.
If the Channel B power LED is lit, check components in the following order:
a. Fans 1 and 2
b. (Trained service technician only) Remove microprocessor 2 (if present). Try
restarting the server.
c. (Trained service technician only) System board
d. (Trained service technician only) Power backplane
3.
If the Channel C power LED is lit, check components in the following order:
a. Fans 3 and 4
b. (Trained service technician only) System board
c. (Trained service technician only) Power backplane
d. (Trained service technician only) Microprocessor 1
4.
If the Channel D power LED is lit, check components in the following order:
a. Remove all DIMMs. Try restarting the server, listening for any memory error
beep codes. If the server restarts, reinstall the DIMMs, one pair at a time, to
isolate the defective DIMM.
b. Fans 5 and 6
c. (Trained service technician only) System board
d. (Trained service technician only) Power backplane
The server does not turn off.
1. Determine whether you are using an Advanced Configuration and Power
Interface (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 pressing 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.
The server unexpectedly shuts
down, and the LEDs on the
operator information panel are
not lit.
See “Solving undetermined problems” in the Problem Determination and Service
Guide.
66 IBM System x3550 Type 7978: Installation Guide
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