Dell OptiPlex 3090 Service Manual page 60

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Steps
1. To remove the dummy metal bracket, insert a flathead screwdriver in the hole of the bracket, push the bracket to release
the bracket, and then lift the bracket out from the system.
NOTE:
This step is applicable only if upgrading a system that previously had no optional I/O port.
2. Insert the optional I/O module (Type-C/HDMI/VGA/DP/Serial) into its slot from the inside of your computer.
3. Connect the I/O cable to the connector on the system board .
4. Replace the two (M3X3) screws to secure the optional I/O module to the system.
Next steps
1. Install the
fan
duct.
2. Install the
front
bezel.
3. Install the
side
cover.
4. Follow the procedure in
60
Removing and installing components
after working inside your
computer.

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