Troubleshooting Your System 119
NOTICE: You can hot-plug the power supplies. One power supply must be installed for the system to operate. The
system is in the redundant mode when two power supplies are installed. Remove and install only one power supply
at a time in a system that is powered on. Operating the system for extended periods of time with only one power
supply installed, without a power supply blank installed, can cause the system to overheat.
Remove the faulty power supply. See "Removing a Power Supply" on page63.
3
Ensure that the power supply is properly installed by removing and reinstalling it. See "Replacing a
Power Supply" on page64.
NOTE: After installing a power supply, allow several seconds for the system to recognize the power supply
and to determine if it is working properly. The power indicator turns green to signify that the power supply is
functioning properly. See "Power Indicator Codes" on page18.
4
Check the indicators to see if the problem is resolved. If not, remove the faulty power supply. See
"Removing a Power Supply" on page63.
5
Install a new power supply. See "Replacing a Power Supply" on page64.
If the problem persists, see "Getting Help" on page 147.
Troubleshooting System Cooling Problems
Problem
• Systems management software issues a fan-related error message.
Action
Ensure that none of the following conditions exist:
• Ambient temperature is too high.
• External airflow is obstructed.
• Cables inside the system obstruct airflow.
• An individual cooling fan has failed. See "Troubleshooting a Fan" on page119.

Troubleshooting a Fan

Problem
• System-status indicator is amber.
• Systems management software issues a fan-related error message.
• Front panel LCD indicates a problem with the fan.
Book.book Page 119 Friday, February 3, 2006 11:09 AM