I opened a Tiny computer up at work and they are almost impsossible to work with. Compaq are just as bad as well. They have deliberatly made it difficult to replace parts because they want you to send the computer in to them so they can charge you for the work. There should be a way of getting the drives out though. Try pulling the front panel off the case and see if there's any screws or releases for the drives. That black plastic contraption is either holding the drives in place or is covering the screws that mount them so try and prise it off or slide it off and you should be able to release the drives. If you can only remove one side panel then the cage that the drives are in should come out to allow you to get to both sides of the drives. Again there could be a couple of screws or a catch under the front panel that releases it.