Working Inside Your Computer 6-83• FAN (for the fan cable)• AUXFAN (for the cable to an auxiliary fan)• POWER (for the power supply cable)• POWER3V (for the 3-volt power cable)7. To work on the system board, place the systemboard assembly on a flat surface, with the systemboard facing up.Replacing the System Board AssemblyTo replace the system board assembly in the chassis, per-form the following steps:1. Reconnect the cables to the system board.Position the system board assembly near the chassis,and reconnect all cables you disconnected in step 6 ofthe preceding procedure. Double-check the cable con-nections before continuing.2. Install the system board assembly in the chassis.Facing the right side of the computer, hold the sys-tem board/mounting plate assembly in position.Align the input/output (I/O) connectors on the backof the system board with the openings in the back ofthe chassis, insert the system board mounting plateunder the two tabs on the chassis (Figure 6-6), andthen slide the system board assembly toward theback of the computer until the mounting screw holesalign with the holes in the chassis.Figure 6-6. Replacing the System BoardAssembly3. Replace and tighten the four mounting-platescrews.4. Replace the computer cover as described in“Replacing the Computer Cover,” earlier in thischapter.system boardmounting platesystem board cablestabs (2)
