- Notes, cautions, and warnings
- Working on your computer
- Removing and installing components
- Recommended tools
- Removing the cover
- Installing the cover
- Removing the front bezel
- Installing the front bezel
- Removing the hard drive assembly
- Installing the hard drive assembly
- Removing the optical drive
- Installing the optical drive
- Removing the intrusion switch
- Installing the intrusion switch
- Removing the memory module
- Installing the memory module
- Installing the optional PCIe SSD card
- Removing the optional PCIe SSD card
- Removing the expansion card
- Installing the expansion card
- Removing the power supply unit (PSU)
- Installing the power supply unit (PSU)
- Removing the power button
- Installing the power button
- Removing the Input/Output (I/O) panel
- Installing the Input/Output (I/O) panel
- Removing the system fan
- Installing the system fan
- Removing the heat sink fan cover
- Installing the heat sink fan cover
- Removing the heat sink assembly
- Installing the heat sink assembly
- Removing the processor
- Installing the processor
- Removing the system board
- Installing the system board
- System board components
- System Setup
- Diagnostics
- Specifications
- Contacting Dell
Dell Precision Tower 3420 Owner's Manual
Jumper settings
To change
a jumper setting, pull the plug off its pin(s) and carefully fit it
down onto the pin(s) indicated on the system board.
| Jumper | Setting | Description |
| PSWD | Default | Short: Default Open: Clear Password |
| RTCRST | Default | Open: Default Short: Real-time clock reset. Can be used for troubleshooting |
| SERVICE_MODE | Default | Open: Default Short: ME disable |
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