Installing a processor.................................................................................................................... 97Power supplies.................................................................................................................................... 99Hot Spare feature.......................................................................................................................... 99Removing a redundant power supply........................................................................................ 100Installing a redundant power supply...........................................................................................101Removing a non-redundant power supply................................................................................102Installing a non-redundant power supply..................................................................................103Removing the power supply unit blank..................................................................................... 104Installing the power supply unit blank....................................................................................... 104System battery...................................................................................................................................104Replacing the system battery..................................................................................................... 104Hard-drive backplane....................................................................................................................... 106Removing the hard-drive backplane..........................................................................................106Installing the hard-drive backplane.............................................................................................113Control-panel assembly.................................................................................................................... 113Removing the control panel........................................................................................................113Installing the control panel..........................................................................................................116Removing the control-panel module......................................................................................... 117Installing the control-panel module.......................................................................................... 120Power interposer board.....................................................................................................................121Removing the power interposer board.......................................................................................121Installing the power interposer board........................................................................................ 122System board.....................................................................................................................................123Removing the system board....................................................................................................... 123Installing the system board......................................................................................................... 125Trusted Platform Module............................................................................................................ 1275 Troubleshooting your system........................................................................ 129Safety first—for you and your system...............................................................................................129Troubleshooting system startup failure........................................................................................... 129Troubleshooting external connections............................................................................................129Troubleshooting the video subsystem............................................................................................. 129Troubleshooting a USB device......................................................................................................... 129Troubleshooting a serial I/O device................................................................................................. 130Troubleshooting a NIC..................................................................................................................... 130Troubleshooting a wet system..........................................................................................................131Troubleshooting a damaged system................................................................................................ 132Troubleshooting the system battery................................................................................................ 132Troubleshooting power supply units................................................................................................133Power source problems....................................................................................................................133Power supply unit problems............................................................................................................. 133Troubleshooting cooling problems..................................................................................................134