152 Troubleshooting Your SystemTroubleshooting a FanWARNING: 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.1 Locate the faulty fan indicated by the LCD panel or the diagnosticsoftware.2 Turn off the system and all attached peripherals.3 Open the system. See "Opening the System" on page 82.4 Reseat the fan's power cable.5 Restart the system.If the fan functions properly, close the system. See "Closing the System" onpage 83.6 If the fan does not function, turn off the system and install a new fan.See "Replacing a Cooling Fan" on page 114.7 Restart the system.If the problem is resolved, close the system. See "Closing the System" onpage 83.If the replacement fan does not operate, see "Getting Help" on page 167.Troubleshooting System MemoryWARNING: 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.1 If the system is operational, run the appropriate online diagnostic test.See "Running the System Diagnostics" on page 163.If diagnostics indicates a fault, follow the corrective actions provided bythe diagnostic program.2 Turn off the system and attached peripherals, and unplug the system fromthe power source. Press the power button with the system unplugged, andthen reconnect the system to power.
