Lenovo System x3550 M5 Installation And Service Manual page 97

Table 18. Power problems and actions (continued)
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
• Go to the Support Web site at http://www.lenovo.com/support to check for technical information, hints,
tips, and new device drivers or to submit a request for information.
Symptom
Pwr rail 4 error has been
recorded in the system event
log.
Pwr rail 5 error has been
recorded in the system 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 system event log:
• Fan 5
• Fan 6
• DIMMs 13 through 24
3. Restart the server. If the Pwr rail 4 error has been recorded in the system event
log again, (trained technician only) replace the system board (see "For service
technician only: removing the system board" on page 276 and "For service
technician only: replacing the system board" on page 279).
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 system event
log again, the component that you just reinstalled is defective. Replace the
defective component.
• DIMMs 13 through 24 (see "Removing a memory module" on page 159 and
"Memory module installation" on page 160).
• Fan 5 (see "Removing a thermal kit (hot-swap fan)" on page 193 and
"Replacing a thermal kit (hot-swap fan)" on page 194).
• Fan 6
1. Disconnect the server power cords.
2. Remove the following components if the Pwr rail 5 error has been recorded in
the system event log:
• Fan 7
• Fan 8
• SAS/SATA hard disk drives and USB
3. Restart the server. If the Pwr rail 5 error has been recorded in the system event
log again, (trained technician only) replace the system board (see "For service
technician only: removing the system board" on page 276 and "For service
technician only: replacing the system board" on page 279).
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 system event
log again, the component that you just reinstalled is defective. Replace the
defective component.
• Hard disk drives and USB
• Fan 7 (see "Removing a thermal kit (hot-swap fan)" on page 193 and
"Memory module installation" on page 160).
• Fan 8
.
Chapter 3 Troubleshooting
83