- Notes, cautions, and warnings
- About your system
- Using the system setup and boot manager
- Installing and removing system components
- Recommended Tools
- Front bezel (optional)
- System cover
- Inside The System
- Cable Management Tray
- System Memory
- General Memory Module Installation Guidelines
- Mode-Specific Guidelines
- Advanced ECC (Lockstep)
- Memory optimized independent channel mode
- Memory sparing
- Memory mirroring
- Fault Resilient Memory
- Sample Memory Configurations
- Removing A Memory-Riser Blank
- Installing A Memory-Riser Blank
- Removing A Memory Riser
- Installing A Memory Riser
- Removing Memory Modules From The Memory Riser
- Installing Memory Modules
- Memory Riser And Fan Cage
- Hard drives
- Optical Drive (Optional)
- Cooling Fans
- Internal USB Memory Key (Optional)
- Expansion Cards And Expansion-Card Risers
- Expansion Card Installation Guidelines
- Removing The Left Expansion Card Riser Blank
- Installing The Left Expansion Card Riser Blank
- Removing The Right Expansion Card Riser Blank
- Removing An Expansion Card From Expansion-Card Risers 2 and 3
- Installing An Expansion Card Into The Expansion-Card Riser 2 and 3
- NDC Riser (I/O Riser 1)
- Network Daughter Card
- SD vFlash card
- Internal Dual SD Module
- Internal SD card
- Integrated Storage Controller Card
- RAID Battery
- Processors
- Power Supplies
- Hot Spare Feature
- Removing an AC power supply
- Installing an AC power supply
- Wiring instructions for a DC power supply
- Assembling And Connecting The Safety Ground Wire
- Assembling The DC Input Power Wires
- Removing A DC Power Supply
- Installing A DC Power Supply
- Removing The Power Supply Blank
- Installing The Power Supply Blank
- Power Distribution Board
- System battery
- Hard-Drive Backplane
- SAS Expander Daughter Card
- Control panel assembly
- System board
- Troubleshooting your system
- Minimum configuration to POST
- Troubleshooting system startup failure
- Troubleshooting external connections
- Troubleshooting the video subsystem
- Troubleshooting a USB device
- Troubleshooting a serial I/O device
- Troubleshooting a wet system
- Troubleshooting a damaged system
- Troubleshooting the system battery
- Troubleshooting power supply units
- Troubleshooting Cooling Problems
- Troubleshooting cooling fans
- Troubleshooting system memory
- Troubleshooting an internal USB key
- Troubleshooting an SD card
- Troubleshooting an optical drive
- Troubleshooting A Hard Drive
- Troubleshooting a storage controller
- Troubleshooting expansion cards
- Troubleshooting Processors
- Using system diagnostics
- Jumpers and connectors
- Technical Specifications
- System messages
- Getting help
Dell PowerEdge R920 System Owner's Manual
Troubleshooting power supply units
CAUTION:Many repairs may only be done by a certified service
technician. You should only perform troubleshooting and simple repairs
as authorized in your product documentation, or as directed by the
online or telephone service and support team. Damage due to servicing
that is not authorized by Dell is not covered by your warranty. Read
and follow the safety instructions that came with the product.
CAUTION:At least one power supply (PSU) must be installed for the system
to operate. Operating the system with only one PSU installed for extended
periods of time can cause the system to overheat.
- Identify the faulty PSU by the PSU's fault indicator.
- Reseat the PSU by removing and reinstalling it.
NOTE:After installing a PSU, allow several seconds for the system to recognize the PSU and to determine if it is working properly.
- If the problem persists, see Getting Help.
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