Troubleshooting Your System 117Troubleshooting Power Supply1 Reseat the power supply by removing and reinstalling it. See "Removingthe Power Supply" on page 99 and "Installing the Power Supply" onpage 100.NOTE: After installing a power supply, allow several seconds for the systemto recognize the power supply and to determine if it is working properly.If the problem persists, replace the faulty power supply.2 If the problem persists, see "Getting Help" on page 135.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, EMI filler panel, memory-module blank, orback-filler bracket is removed.• Ambient temperature is too high.• External airflow is obstructed.• The cooling fan is removed or has failed. See "Troubleshooting CoolingFan" on page 118.• The expansion card installation guidelines have not been followed. See"Expansion Card Installation Guidelines" on page 81.
