Removing the I/O board.............................................. 55Prerequisites........................................................................................... 55Procedure............................................................................................... 55Replacing the I/O board...............................................57Procedure............................................................................................... 57Post-requisites........................................................................................ 57Removing the heat-sink assembly................................58Prerequisites........................................................................................... 58Procedure............................................................................................... 58Replacing the heat-sink assembly................................60Procedure............................................................................................... 60Post-requisites........................................................................................60Removing the power-button module............................62Prerequisites........................................................................................... 62Procedure............................................................................................... 62Replacing the power-button module............................65Procedure............................................................................................... 65Post-requisites........................................................................................65Removing the system board........................................ 66Prerequisites........................................................................................... 66Procedure............................................................................................... 66Replacing the system board......................................... 71Procedure................................................................................................ 71Post-requisites........................................................................................ 726