Troubleshooting Your System 143Troubleshooting Power SupplyCAUTION: At least one power supply must be installed for the system to operate.Operating the system with only one power supply installed for extended periods oftime can cause the system to overheat.1 Reseat the power supply by removing and reinstalling it. See "PowerSupplies" on page 117.NOTE: After installing a power supply, allow several seconds for the systemto recognize the power supply and to determine if it is working properly. Thepower indicator turns green to signify that the power supply is functioningproperly.2 If the problem persists, replace the faulty power supply.If the problem is not resolved by replacing the power supply, see "GettingHelp" on page 161.Troubleshooting System Cooling ProblemsCAUTION: 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.Ensure that none of the following conditions exist:• System cover, cooling shroud, hard-drive blank, power-supply blank, orback filler bracket is removed.• Ambient temperature is too high.• External airflow is obstructed.• An individual cooling fan is removed or has failed. See "Troubleshooting aFan" on page 144.
