Dell OptiPlex 755 User Manual page 241

1 hard drive bracket
2 screw
3 fan release tab
4 fan
5 side tab
4. Replace the hard drive fan:
a. Plug the fan into the computer.
b. Align the four side tabs and release tab on the fan with the five corresponding slots on the hard drive bracket.
c. Slide the release tab beneath the metal housing covering its slot, and then slide the fan towards the back of the computer.
d. Replace the screw to secure the fan release tab to the hard drive bracket.
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