Replacing the heat-sink assembly................................ 54Procedure............................................................................................... 54Post-requisites........................................................................................ 54Removing the I/O board.............................................. 56Prerequisites........................................................................................... 56Procedure............................................................................................... 56Replacing the I/O board...............................................58Procedure............................................................................................... 58Post-requisites........................................................................................ 58Removing the system board.........................................59Prerequisites........................................................................................... 59Procedure............................................................................................... 60Replacing the system board......................................... 64Procedure............................................................................................... 64Post-requisites........................................................................................ 65Removing the power-adapter port............................... 66Prerequisites........................................................................................... 66Procedure............................................................................................... 66Replacing the power-adapter port............................... 68Procedure............................................................................................... 68Post-requisites........................................................................................ 68Removing the power-button board...............................70Prerequisites............................................................................................70Procedure................................................................................................706