Safety First—For You And Your System
............................................................................................................... 127
Troubleshooting System Startup Failure
.............................................................................................................. 127
Troubleshooting External Connections
.................................................................................................................127
Troubleshooting The Video Subsystem
................................................................................................................ 127
Troubleshooting A USB Device
............................................................................................................................ 127
Troubleshooting A Serial I/O Device
.................................................................................................................... 128
Troubleshooting A NIC
..........................................................................................................................................128
Troubleshooting A Wet System
............................................................................................................................129
Troubleshooting A Damaged System
................................................................................................................... 129
Troubleshooting The System Battery
................................................................................................................... 130
Troubleshooting A Non-Redundant Power Supply
...............................................................................................130
Troubleshooting Redundant Power Supplies
....................................................................................................... 131
Troubleshooting Cooling Problems
.......................................................................................................................131
Troubleshooting Cooling Fans
.............................................................................................................................. 131
Troubleshooting System Memory
.........................................................................................................................131
Troubleshooting An Internal USB Key
..................................................................................................................132
Troubleshooting An SD Card
................................................................................................................................ 133
Troubleshooting An Optical Or Tape Drive
...........................................................................................................133
Troubleshooting A Hard Drive
.............................................................................................................................. 134
Troubleshooting Expansion Cards
........................................................................................................................134
Troubleshooting Processor
.................................................................................................................................. 135
6 Using System Diagnostics..................................................................................................... 137
Dell Online Diagnostics
.........................................................................................................................................137
Dell Embedded System Diagnostics
..................................................................................................................... 137
When To Use The Embedded System Diagnostics
........................................................................................137
Running The Embedded System Diagnostics
.................................................................................................137
System Diagnostic Controls
........................................................................................................................... 138
7 Jumpers And Connectors...................................................................................................... 139
System Board Jumper Settings
............................................................................................................................139
System Board Jumpers And Connectors
............................................................................................................. 140
Disabling A Forgotten Password
.......................................................................................................................... 142
8 Technical Specifications....................................................................................................... 143
9 System Messages...................................................................................................................149
LCD Messages
......................................................................................................................................................149
Viewing LCD Messages
................................................................................................................................. 149
Removing LCD Messages
...............................................................................................................................149
System Error Messages
........................................................................................................................................149
Warning Messages
...............................................................................................................................................165
Summary of Contents for PowerEdge T420
Page 8: ...Diagnostic Messages 165 Alert Messages 165 10 Getting Help 167 Contacting Dell 167 ...
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