- 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 Tower
- Side cover
- Front bezel
- Fan duct
- 2.5-inch hard-drive assembly
- 3.5-inch hard drive
- Solid-state drive
- Memory modules
- Processor fan and heat-sink assembly
- Processor
- Graphics card
- Graphical processing unit
- Coin-cell battery
- WLAN card
- Slim optical-drive
- Slim optical-drive bracket
- Speaker
- Power button
- Power-supply unit
- Intrusion switch
- Optional I/O modules (HDMI/VGA/DP/Serial)
- System board
- Drivers and downloads
- BIOS setup
- Troubleshooting
- Getting help and contacting Dell