Heat sink and processor..................................................................................................................... 98Removing the heat sink................................................................................................................ 98Removing the processor...............................................................................................................99Installing the processor............................................................................................................... 101Installing the heat sink.................................................................................................................103Power supply units............................................................................................................................105Hot spare feature.........................................................................................................................105Removing a redundant power supply unit.................................................................................105Installing a redundant power supply unit...................................................................................106Removing the power supply unit blank......................................................................................107Installing the power supply unit blank....................................................................................... 108System battery...................................................................................................................................108Replacing the system battery..................................................................................................... 108Hard drive backplane.........................................................................................................................110Removing the hard drive backplane........................................................................................... 110Installing the hard drive backplane............................................................................................. 119Control panel assembly.....................................................................................................................119Removing the LCD control panel assembly............................................................................... 119Installing the LCD control panel assembly................................................................................. 121Removing the LED control panel assembly............................................................................... 122Installing the LED control panel assembly................................................................................. 123Power interposer board.................................................................................................................... 124Removing the power interposer board...................................................................................... 124Installing the power interposer board........................................................................................ 125Trusted Platform Module.................................................................................................................. 126Installing the Trusted Platform Module...................................................................................... 126Re-enabling the TPM for BitLocker users...................................................................................127Re-enabling the TPM for TXT users............................................................................................ 127System board.....................................................................................................................................128Removing the system board....................................................................................................... 128Installing the system board......................................................................................................... 1305 Troubleshooting your system........................................................................ 133Safety first—for you and your system...............................................................................................133Troubleshooting system startup failure............................................................................................133Troubleshooting external connections............................................................................................ 133Troubleshooting the video subsystem............................................................................................. 133Troubleshooting a USB device......................................................................................................... 133Troubleshooting iDRAC Direct (USB XML configuration)................................................................134Troubleshooting iDRAC Direct (Laptop connection)...................................................................... 135Troubleshooting a serial I/O device................................................................................................. 135Troubleshooting an NIC....................................................................................................................1356