Installing the cable routing clip.................................................................................................. 102System board.....................................................................................................................................102Removing the system board....................................................................................................... 102Installing the system board......................................................................................................... 105Trusted Platform Module..................................................................................................................108Installing the Trusted Platform Module......................................................................................108Re-enabling the TPM for BitLocker users.................................................................................. 109Re-enabling the TPM for TXT users........................................................................................... 109Cooling fans.......................................................................................................................................110Removing a cooling fan.............................................................................................................. 110Installing a cooling fan................................................................................................................. 111Graphics processing unit...................................................................................................................112GPU installation guidelines..........................................................................................................112Removing a GPU blank (optional)............................................................................................... 112Removing a GPU riser cable from the system board................................................................. 114Removing a GPU..........................................................................................................................115Removing a GPU riser cable board............................................................................................. 116Removing the custom GPU brackets from the GPU removed from your system....................118Removing the GPU brackets from the replacement GPUs........................................................119Installing the GPU brackets on the GPU removed from your system....................................... 121Installing the custom GPU brackets on the replacement GPU................................................. 122Installing a GPU riser cable board...............................................................................................122Installing a GPU blank..................................................................................................................123Installing a GPU........................................................................................................................... 124Installing a GPU riser cable on the system board...................................................................... 124GPU cabling diagrams.................................................................................................................126GPU switch board (optional).............................................................................................................134Removing the optional GPU switch board ................................................................................134Installing the optional GPU switch board ..................................................................................135Control panel module.......................................................................................................................136Removing the control panel module......................................................................................... 136Installing the control panel module............................................................................................1375 Troubleshooting your system........................................................................ 139Safety first—for you and your system...............................................................................................139Troubleshooting system startup failure........................................................................................... 139Troubleshooting external connections............................................................................................139Troubleshooting the video subsystem............................................................................................. 139Troubleshooting a USB device......................................................................................................... 139Troubleshooting a serial I/O device................................................................................................. 140Troubleshooting a NIC..................................................................................................................... 140Troubleshooting a wet system..........................................................................................................141