Installing The Hard-Drive Backplane

103

Control Panel Assembly

104

Removing The Control-Panel Assembly

104

Installing The Control-Panel Assembly

105

System Board

105

Removing The System Board

105

Installing The System Board

107

4 Troubleshooting Your System

109

Safety First—For You And Your System

109

Troubleshooting System Startup Failure

109

Troubleshooting External Connections

109

Troubleshooting The Video Subsystem

109

Troubleshooting A USB Device

109

Troubleshooting A Serial I/O Device

110

Troubleshooting A NIC

110

Troubleshooting A Wet System

110

Troubleshooting A Damaged System

111

Troubleshooting The System Battery

112

Troubleshooting Power Supplies

112

Troubleshooting Cooling Problems

112

Troubleshooting Cooling Fans

113

Troubleshooting System Memory

113

Troubleshooting An Internal USB Key

114

Troubleshooting An SD Card

114

Troubleshooting An Optical Drive

115

Troubleshooting A Tape Backup Unit

115

Troubleshooting A Hard Drive

115

Troubleshooting A Storage Controller

116

Troubleshooting Expansion Cards

117

Troubleshooting Processors

117

5 Using System Diagnostics

119

Dell Online Diagnostics

119

Dell Embedded System Diagnostics

119

When To Use The Embedded System Diagnostics

119

Running The Embedded System Diagnostics

120

System Diagnostic Controls

120

6 Jumpers And Connectors

121

System Board Jumper Settings

121

System Board Connectors

122

Page 6
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Dell E21S001, R820 owner manual Troubleshooting Your System, Using System Diagnostics, Jumpers And Connectors