Troubleshooting Your System 155c Remove the processor airflow shroud (see "Removing the ProcessorAirflow Shroud" on page 70).d Verify that the cable connections between the hard drive(s) and thedrive controller are correct, whether the connections are to the SATAconnectors on the system board, a SAS expansion card, or a SAS RAIDcontroller (see "Hard Drives" on page 77).e Verify that the SAS or SATA cables are securely seated in theirconnectors.f Replace the processor airflow shroud (see "Installing the ProcessorAirflow Shroud" on page 72).g Close the system (see "Installing the System Cover" on page 67).h Reconnect the system to the electrical outlet, and turn on the systemand attached peripherals.If the problem persists, see "Getting Help" on page 175.Troubleshooting a Hot-pluggable Hard DriveProblem• Device driver error.• One or more hard drives not recognized by the system.ActionCAUTION: 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.NOTICE: This troubleshooting procedure can destroy data stored on the harddrive. Before you proceed, back up all files on the hard drive.1 Run the appropriate online diagnostics test (see "Using Dell PowerEdgeDiagnostics" on page 163).Depending on the results of the diagnostics test, proceed as neededthrough the following steps.
