Replacing the Heat-Sink | 43Replacing the Heat-SinkWARNING: Before working inside your computer, read the safety informationthat shipped with your computer and follow the steps in "Before You Begin" onpage 7. After working inside your computer, follow the instructions in "AfterWorking Inside Your Computer" on page 9. For additional safety bestpractices information, see the Regulatory Compliance Homepage atdell.com/regulatory_compliance.Procedure1 Clean the thermal grease from the bottom of the heat-sink and reapply it.2 Align the screw holes on the heat-sink with the screw holes on the system board.3 In sequential order (indicated on the heat-sink), replace the screws that secure theheat-sink to the system boardPostrequisites1 Replace the system board. See "Replacing the System Board" on page 37.2 Replace the wireless mini-card. See "Replacing the Wireless Mini-Card" on page 30.3 Replace the palm-rest. See "Replacing the Palm-Rest" on page 27.4 Replace the keyboard. See "Replacing the Keyboard" on page 23.5 Replace the optical-drive assembly. See "Replacing the Optical-Drive Assembly" onpage 17.6 Replace the hard-drive assembly. See "Replacing the Hard-Drive Assembly" onpage 20.7 Follow the instructions from step 3 and step 4 in "Replacing the Memory Module(s)"on page 14.8 Replace the battery. See "Replacing the Battery" on page 11.