150 Troubleshooting Your System4 Ensure that the expansion-card riser is firmly seated in its connector.See "Installing an Expansion Card" on page 89.5 Close the system. See "Closing the System" on page 77.6 Reconnect the system to the electrical outlet, and turn on the system andattached peripherals.7 If the problem is not resolved, turn off the system and attachedperipherals, and disconnect the system from the electrical outlet.8 Open the system. See "Opening the System" on page 76.9 Remove the expansion card. See "Removing an Expansion Card" onpage 88.10 Close the system. See "Closing the System" on page 77.11 Reconnect the system to the electrical outlet, and turn on the system andattached peripherals.12 Run the appropriate online diagnostic test.If the tests fail, see "Getting Help" on page 161 .Troubleshooting the ProcessorCAUTION: 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 Run the appropriate online diagnostics test. See "Using OnlineDiagnostics" on page 153.2 Turn off the system and attached peripherals, and disconnect the systemfrom the electrical outlet.3 Open the system. See "Opening the System" on page 76.4 Remove the cooling shroud. See "Removing the Cooling Shroud" onpage 93.5 Ensure that the processor and heat sink are properly installed.See "Processor" on page 112.6 Close the system. See "Closing the System" on page 77.
