IBM x3550 Problem Determination And Service Manual page 151

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 7978 and 1913 server," on page 29 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 server does not start.
The server does not turn off.
The server unexpectedly shuts
down, and the LEDs on the
operator information panel are
not lit.
Action
Check the four 12-volt power LEDs (A, B, C, and D) on the system board. See
"Internal LEDs, connectors, and jumpers" on page 9 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 order listed below.
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 (see "Installing a memory module" on page 54).
b. Fans 5 and 6
c. (Trained service technician only) System board
d. (Trained service technician only) Power backplane
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.
See "Solving undetermined problems" on page 166.
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Chapter 5. Diagnostics