Dell OptiPlex 755 User Manual page 253

3 Remove the hard drive fan:
Remove the screw that secures the fan release tab to the hard drive bracket.
a
Press down on the fan release tab, and then slide the fan towards the front of the computer so that
b
its side tabs are free of the corresponding slots in the hard drive bracket.
Lift to remove the fan from the hard drive bracket.
c
Unplug the fan.
d
3
2
1
4
1 hard drive bracket
2 screw
3 fan release tab
4 fan
5 side tab
5
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Drives