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Removing A Processor.....................................................................................................................................86

Installing A Processor......................................................................................................................................89

Power Supplies.......................................................................................................................................................90

Hot Spare Feature............................................................................................................................................91

Removing An AC Power Supply.......................................................................................................................91

Installing An AC Power Supply........................................................................................................................92

Wiring Instructions For A DC Power Supply....................................................................................................93

Removing A DC Power Supply.........................................................................................................................95

Installing A DC Power Supply..........................................................................................................................96

Removing The Power Supply Blank.................................................................................................................97

Installing The Power Supply Blank..................................................................................................................97

System Battery.......................................................................................................................................................97

Replacing The System Battery.........................................................................................................................97

Hard-Drive Backplane............................................................................................................................................98

Removing The Hard-Drive Backplane..............................................................................................................99

Installing The Hard-Drive Backplane.............................................................................................................112

Removing The Optional Hard-Drive Backplane (Back)..................................................................................113

Installing The Optional Hard-Drive Backplane (Back)...................................................................................115

Control Panel........................................................................................................................................................116

Removing The Control Panel (PowerEdge R720)............................................................................................116

Installing The Control Panel (PowerEdge R720).............................................................................................118

Removing The Control Panel (PowerEdge R720xd)........................................................................................118

Installing The Control Panel (PowerEdge R720xd).........................................................................................119

Removing The I/O Panel (PowerEdge R720xd)...............................................................................................120

Installing The I/O Panel (PowerEdge R720xd)................................................................................................121

System Board........................................................................................................................................................121

Removing The System Board.........................................................................................................................121

Installing The System Board..........................................................................................................................123

4 Troubleshooting Your System...............................................................................................125

Safety First—For You And Your System...............................................................................................................125

Troubleshooting System Startup Failure..............................................................................................................125

Troubleshooting External Connections.................................................................................................................125

Troubleshooting The Video Subsystem................................................................................................................125

Troubleshooting A USB Device............................................................................................................................125

Troubleshooting A Serial I/O Device....................................................................................................................126

Troubleshooting A NIC..........................................................................................................................................126

Troubleshooting A Wet System............................................................................................................................126

Troubleshooting A Damaged System...................................................................................................................127

Troubleshooting The System Battery...................................................................................................................128

Troubleshooting Power Supplies..........................................................................................................................128

Troubleshooting Cooling Problems.......................................................................................................................128