136 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 exist:• System cover, cooling shroud, drive blank, memory-module blank,power-supply blank, or back filler bracket is removed.• Heat-sink blank is removed (in single-processor configurations).• Ambient temperature is too high. See your Getting Started Guide foryour system’s operating temperature requirements.• External airflow is obstructed.• Cables inside the system obstruct airflow.• An individual cooling fan is removed or has failed. See "Troubleshooting aFan" on page 136.• The expansion card installation guidelines have not been followed. See"Expansion Card Installation Guidelines" on page 103.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 is notcovered by your warranty. Read and follow the safety instructions that camewith the product.1 Turn off the system and all attached peripherals.2 Open the system. See "Opening the System" on page 79.3 Locate the faulty fan indicated by the LCD panel or the diagnosticsoftware.4 Reseat the fan's power cable.
