HP dx2290 - Microtower PC Service & Reference Manual page 48

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Release the drive by removing the screw from the chassis then pulling the drive part way out
of the front of the chassis.
5. Connect the power and data cables from the back of the optical drive you want to add.
6. On models with a latch mechanism securing the drive in place, slide the drive all the way in through
the front of the chassis until it locks into place and make sure the drive latch pin is fully inserted
into the hole labeled.
On models with a screw securing the drive in place, slide the drive in through the front of the chassis
until the bezel on the drive is evenly aligned with the computer front bezel and install the screw.
40 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis