HP C240 - Manual (Page 160)

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Changing Your Workstation’s Hardware Configuration
Installing an EISA, PCI, or GSC Option Board
4 Remove the EISA slider, as shown in Figure 52.
5 In the desired EISA slot, turn the blank plate’s locking knob counter-clockwise
to unlock the plate, as shown in Figure 52.
Figure 52 Removing the EISA Slider and Blank Plate
6 Remove the blank plate from the slot, as shown in Figure 52.
Blank Plate
Locking Knob
EISA Slider