Dell Optiplex SX280 Replacement Manual page 6

Replacing Dell Optiplex SX280 Motherboard
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Step 9
Press on the blue release tab and pull the upper fan out
of the computer.
Step 10 - Lower Fan
Remove the power supply that connects the lower fan
to the motherboard, distinguished by it's black, red,
green and yellow wires.
Make sure to press on the release tab while
removing the power supply.
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