- Notes, cautions, and warnings
- Working inside your computer
- Removing and installing components
- Recommended tools
- Screw List
- Major components of your system
- Side cover
- Front bezel
- Hard-drive assembly
- Removing the primary 2.5-inch hard-drive assembly
- Removing the secondary 2.5-inch hard-disk drive assembly
- Removing the 2.5-inch hard-disk drive bracket
- Installing the 2.5-inch hard-disk drive bracket
- Installing the secondary 2.5-inch hard-disk drive assembly
- Installing the primary 2.5-inch hard-drive assembly
- 3.5 in. hard-drive assembly
- Solid-state drive
- Memory module
- Processor fan and heat-sink assembly
- Processor
- Graphics card
- Graphical processing unit
- Coin-cell battery
- WLAN card
- Slim optical-drive
- Slim optical-drive bracket
- Chassis fan
- Voltage regulator heat sink
- Speaker
- Power button
- Power-supply unit
- Intrusion switch
- Optional I/O modules (Type C/ HDMI/VGA/DP/Serial)
- System board
- Software
- System setup
- Troubleshooting
- Getting help and contacting Dell
OptiPlex 7090 Tower Service Manual
Installing the power-supply unit (For systems with powered GPU)
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
WARNING The cables and ports on the back of the power-supply unit are color-coded to indicate the different power wattage. Ensure that you plug in the cable to the correct port. Failure to do so may result in damaging the power-supply unit and/or system components.
About this task
The following images indicate the location of the power-supply unit and provides a visual representation of the installation procedure.
Steps
- Slide the power-supply unit into the chassis until the securing tab snaps into position.
- Replace the three screws (#6-32) that secure the power-supply unit to the chassis.
- Route the power cable through the routing guides on the chassis and connect the power cables to their respective connectors on the system board.
- Align the triangles on the powered GPU cable holder with the triangles on the chassis.
- Place the powered GPU cable holder on the computer chassis until it clicks to place.
- Route the power cable through the retention tab on the cable holder.
- Connect the two power cables, through the slot on the cable holder, to the connector on the powered GPU.
Next steps
- Install the processor fan and 125 W heat-sink assembly or processor fan and heat-sink assembly.
- Install the side cover.
- Follow the procedure in after working inside your computer.
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