Re: CD-ROM Drive.
If you are able to open an "close" the CD Drive, then it seems like you do have power to the drive, and that it is not a slot-loading drive. It seems to be a generic CD Drive.
So, with that information, do you happen to know how you are connecting the CD Drives to the motherboard of the computer? Is it by IDE cable or Sata cable? Technically, you do need a "device driver" for most hardware (USB excluded -- provides its own driver), but you don't always logically need a driver for a CD Drive to work. It would just perform the basic functions of the drive: "Read".
Going with what Luke is saying, I would say to make sure you are connecting the data cables correctly, whether it be, IDE or Sata.