Dell R820 Computer Hardware User Manual


 
Removing The Control-Panel Assembly...........................................................................................................98
Installing The Control-Panel Assembly............................................................................................................99
System Board..........................................................................................................................................................99
Removing The System Board...........................................................................................................................99
Installing The System Board.......................................................................................................................... 101
4 Troubleshooting Your System............................................................................................... 103
Safety First—For You And Your System............................................................................................................... 103
Troubleshooting System Startup Failure.............................................................................................................. 103
Troubleshooting External Connections.................................................................................................................103
Troubleshooting The Video Subsystem................................................................................................................103
Troubleshooting A USB Device............................................................................................................................ 103
Troubleshooting A Serial I/O Device.................................................................................................................... 104
Troubleshooting A NIC..........................................................................................................................................104
Troubleshooting A Wet System............................................................................................................................105
Troubleshooting A Damaged System................................................................................................................... 105
Troubleshooting The System Battery................................................................................................................... 106
Troubleshooting Power Supplies..........................................................................................................................106
Troubleshooting Cooling Problems.......................................................................................................................106
Troubleshooting Cooling Fans.............................................................................................................................. 107
Troubleshooting System Memory.........................................................................................................................107
Troubleshooting An Internal USB Key..................................................................................................................108
Troubleshooting An SD Card................................................................................................................................ 108
Troubleshooting An Optical Drive.........................................................................................................................109
Troubleshooting A Tape Backup Unit...................................................................................................................109
Troubleshooting A Hard Drive.............................................................................................................................. 110
Troubleshooting A Storage Controller..................................................................................................................110
Troubleshooting Expansion Cards........................................................................................................................111
Troubleshooting Processors.................................................................................................................................112
5 Using System Diagnostics..................................................................................................... 113
Dell Online Diagnostics.........................................................................................................................................113
Dell Embedded System Diagnostics.....................................................................................................................113
When To Use The Embedded System Diagnostics........................................................................................113
Running The Embedded System Diagnostics.................................................................................................113
System Diagnostic Controls........................................................................................................................... 114
6 Jumpers And Connectors...................................................................................................... 115
System Board Jumper Settings............................................................................................................................115
System Board Connectors....................................................................................................................................116
Disabling A Forgotten Password.......................................................................................................................... 118