Dell PowerEdge R905 Hardware Owner's Manual (PDF) - Page 8
Troubleshooting Your System, Troubleshooting a Serial I/O Device - power supply
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Processor Expansion Module Board (Service-Only Procedure 139 Removing the PEM Board 139 Replacing the PEM Board 140 4 Troubleshooting Your System 143 Safety First-For You and Your System 143 Start-Up Routine 143 Checking Basic Power Problems 144 Checking the Equipment 144 Troubleshooting External Connections 144 Troubleshooting the Video Subsystem 145 Troubleshooting the Keyboard or Mouse. . . . . 146 Troubleshooting Serial I/O Problems 148 Troubleshooting a Serial I/O Device 148 Troubleshooting a USB Device 149 Troubleshooting a NIC 151 Troubleshooting a Wet System 152 Troubleshooting a Damaged System 152 Troubleshooting the System Battery 153 Troubleshooting Power Supplies 154 Troubleshooting System Cooling Problems 155 Troubleshooting a Fan 155 Troubleshooting System Memory 156 Troubleshooting an Optical Drive 158 8 Contents