- Notes, cautions, and warnings
- Working inside your computer
- Major components of your system
- Removing and installing components
- Recommended tools
- Screw list
- Major components of OptiPlex 3090 Small Form Factor
- Side cover
- Front bezel
- 2.5-inch hard drive
- 3.5-inch hard drive
- M.2 solid state drive
- Hard-drive and optical-drive bracket
- Optical drive
- WLAN card
- Fan assembly
- Coin-cell battery
- Expansion card
- Memory module
- Processor
- Power-supply unit
- Intrusion switch
- Power button
- Optional I/O modules (HDMI/VGA/DP/Serial)
- System board
- Drivers and downloads
- BIOS Setup
- Troubleshooting
- Getting help and contacting Dell Technologies