HP Visualize c160 Owner's Manual page 149

8 Make sure that the EISA fan is fully rotated, as shown in Figure 45.
Figure 45
9 Slide the option boards into the slots that they came out of, as shown in Figure
Figure 46
Installing the EGRAM (Enhanced Graphics RAM) Module (C160/C180)
Rotating the EISA Fan
46. Make sure that the hole in each board's handle aligns with the pin on the back
panel.
Installing an Option Board
Changing Your Workstation's Hardware Configuration
133