156 Troubleshooting Your SystemTroubleshooting System Cooling ProblemsCAUTION: Many repairs may only be done by a certified service technician.You should only perform troubleshooting and simple repairs as authorized inyour product documentation, or as directed by the online or telephone serviceand support team. Damage due to servicing that is not authorized by Dell isnot covered by your warranty. Read and follow the safety instructions thatcame with the product.Ensure that none of the following conditions exists:• System cover, system board shroud, power distribution board shroud,hard-drive blank, or front or back filler panel is removed.• Ambient temperature is too high.• External airflow is obstructed.• Cables inside the system obstruct airflow.• An individual cooling fan is removed or has failed. See "Troubleshooting aFan" on page 156.Troubleshooting a FanCAUTION: Many repairs may only be done by a certified service technician.You should only perform troubleshooting and simple repairs as authorized inyour product documentation, or as directed by the online or telephone serviceand support team. Damage due to servicing that is not authorized by Dell isnot covered by your warranty. Read and follow the safety instructions thatcame with the product.1 Open the system. See "Opening the System" on page 82.CAUTION: The cooling fans are hot-swappable. To maintain proper cooling whilethe system is on, only replace one fan at a time.2 Locate the faulty fan indicated by the LCD panel or the diagnosticsoftware.3 Turn off the system and all attached peripherals.4 Remove and reseat the fan. See "Removing a Cooling Fan" on page 117.5 Restart the system.NOTE: Wait at least 30 seconds for the system to recognize the fan anddetermine whether it is working properly.
