168 Troubleshooting Your System• Cables inside the system obstruct airflow.• An individual cooling fan is removed or has failed. See "Troubleshooting aFan" on page 168.• The expansion card installation guidelines have not been followed. See"Expansion Card Installation Guidelines" on page 114.Troubleshooting a FanCAUTION: Many repairs may only be done by a certified service technician. Youshould only perform troubleshooting and simple repairs as authorized in yourproduct documentation, or as directed by the online or telephone service andsupport team. Damage due to servicing that is not authorized by Dell is not coveredby your warranty. Read and follow the safety instructions that came with theproduct.1 Open the system. See "Opening the System" on page 84.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 Remove and reseat the fan. See "Removing a Cooling Fan" on page 108and "Installing a Cooling Fan" on page 110.NOTE: Wait at least 30 seconds for the system to recognize the fan anddetermine whether it is working properly.4 If the problem is not resolved, install a new fan. See "Removing a CoolingFan" on page 108 and "Installing a Cooling Fan" on page 110.If the replacement fan is working properly, close the system. See "Closingthe System" on page 85.If the replacement fan does not operate, see "Getting Help" on page 195.
