Compaq Prolinea Family Maintenance & Serice Manual page 91

6. Elevating the drive cage will provide access to the drive cable
connectors and power switch cable clamps on the floor of the chassis.
Push the metal drive cage release (Figure 5-13) away from the drive
cage and elevate the back end of the drive cage. The drive cage
release will engage a cutout in the side of the drive cage when it has
been elevated the proper amount (Figure 5-13).