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

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