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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v If an action step is preceded by "(Trained technician only)," that step must be performed only by a Trained
service technician.
v Go to the IBM support website at http://www.ibm.com/supportportal/ to check for technical information,
hints, tips, and new device drivers or to submit a request for information.
Symptom
The OVER SPEC LED on the
light path diagnostics panel is
lit, or the Pwr rail 4 error has
been recorded in the IMM2
event log.
The OVER SPEC LED on the
light path diagnostics panel is
lit, or the Pwr rail 5 error has
been recorded in the IMM2
event log.
Action
1. Disconnect the server power cords.
2. Remove the following components if the Pwr rail 4 error has been recorded in
the IMM2 event log:
v Optional PCI adapter power cable (if one is present)
v Hard disk drives
v DIMMs 5 through 8
3. Restart the server. If the Pwr rail 4 error has been recorded in the IMM2 event
log again, (trained service technician only) replace the system-board tray (see
"Removing the system-board tray" on page 335 and "Installing the
system-board tray" on page 338).
4. Reinstall the components one at a time, in the order shown, restarting the
server each time. If the Pwr Rail 4 error has been recorded in the IMM2 event
log again, the component that you just reinstalled is defective. Replace the
defective component.
v DIMMs 5 through 8 (see "Removing a memory module" on page 309 and
"Installing a memory module" on page 310).
v Hard disk drives
v Optional PCI adapter power cable (if one is present)
5. Follow actions in "Solving power problems" on page 256, if the OVER SPEC
LED on the light path diagnostics panel is still lit.
6. Replace the power supply if the OVER SPEC LED on the light path diagnostics
panel is still lit.
1. Disconnect the server power cords.
2. Remove the following components if the Pwr rail 5 error has been recorded in
the IMM2 event log:
v Optional DVD drive (if one is installed)
v Hard disk drives
v DIMMs 9 through 16
3. Restart the server. If the Pwr rail 5 error has been recorded in the IMM2 event
log again, (trained service technician only) replace the system board (see
"Removing the system-board tray" on page 335 and "Installing the
system-board tray" on page 338).
4. Reinstall the components one at a time, in the order shown, restarting the
server each time. If the Pwr Rail 5 error has been recorded in the IMM2 event
log again, the component that you just reinstalled is defective. Replace the
defective component.
v DIMMs 9 through 12 (see "Removing a memory module" on page 309 and
"Installing a memory module" on page 310).
v Hard disk drives
5. Follow actions in "Solving power problems" on page 256, if the OVER SPEC
LED on the light path diagnostics panel is still lit.
6. Replace the power supply if the OVER SPEC LED on the light path diagnostics
panel is still lit.
183
Chapter 3. Diagnostics
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