156 Troubleshooting Your System5 Run the appropriate online diagnostics tests. See "Running the SystemDiagnostics" on page 163.6 Turn off the system and attached peripherals, and disconnect the systemfrom the electrical outlet.WARNING: Only trained service technicians are authorized to remove the systemcover and access any of the components inside the system. Before you begin thisprocedure, review the safety instructions that came with the system.7 Open the system. See "Opening the System" on page 82.8 Reseat the controller card in the expansion card slot.9 Close the system. See "Closing the System" on page 83.10 Reconnect the system to the electrical outlet, and turn on the system,including attached peripherals.If the problem is not resolved, see the documentation for the tape drive foradditional troubleshooting instructions.If you cannot resolve the problem, see ""Getting Help" on page 167."Troubleshooting a Hard DriveWARNING: Only trained service technicians are authorized to remove the systemcover and access any of the components inside the system. Before you begin thisprocedure, review the safety instructions that came with the system.CAUTION: 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™Diagnostics" on page 163.Depending on the results of the diagnostics test, proceed as neededthrough the following steps.2 If installed, remove the optional front bezel. See "Removing and Replacingthe Optional Front Bezel" on page 81.
