www.gateway.com538 If this is a new heat sink, remove the strip on the heatsink that covers the gray thermal grease. If you arere-using a heat sink, use rubbing (isopropyl) alcohol toremove the old thermal grease, then re-apply a smallbead of thermal grease (about the size of a pea) to thesurface that contacts the processor.9 Place the heat sink and fan assembly on the processor,then tighten the screws that secure it to the systemboard.10 Connect the heat sink fan cable to the system board.11 Replace the side panel by following the instructions in“Replacing the side panel” on page 40.Adding or replacing anexpansion cardTo add or replace an expansion card:1 Remove the side panel by following the instructions in“Removing the side panel” on page 37.2 If you are replacing an expansion card, disconnect anycables that are attached to the card, noting theirlocations and orientation. (You may need to reconnectthe cables after you install the new card.)3 Open the card retention lever.