126 System Board4 Connect the fan cable and AC-adapter connector cable to their connectorson the system board.5 Replace the I/O board (see "Replacing the I/O Board" on page 113).6 Replace the processor module (see "Replacing the Processor Module" onpage 109).7 Replace the heat sink (see "Replacing the Heat Sink" on page 103).8 Follow the instructions from step 11 to step 15 in "Replacing the TopCover" on page 84.9 Slide the USB-board cable into the system-board connector and pressdown on the connector latch to secure the cable.10 Replace the coin-cell battery (see "Replacing the Coin-Cell Battery" onpage 52).11 Replace the bluetooth card (see "Replacing the Bluetooth Card" onpage 56).12 Replace the Mini-Card(s) (see "Replacing the Mini-Card(s)" on page 23).13 Replace the display assembly (see "Replacing the Display Assembly" onpage 62).14 Replace the keyboard (see "Replacing the Keyboard" on page 45).15 Replace the palm-rest assembly (see "Replacing the Palm-Rest Assembly"on page 40).16 Replace the optical drive (see "Replacing the Optical Drive" on page 34).17 Follow the instructions in step 5 in "Replacing the Hard Drive(s)" onpage 30.18 Replace the memory module(s) (see "Replacing the Memory Module(s)"on page 18).19 Replace the module cover (see "Replacing the Module Cover" on page 16).20 Replace the battery (see "Replacing the Battery" on page 14).21 Replace any blank or card you removed from the Media Card Reader.CAUTION: Before turning on the computer, replace all screws and ensure that nostray screws remain inside the computer. Failure to do so may result in damage tothe computer.22 Turn on the computer.