I recently replaced the Optiarc AD7560S optical drive in my Inspiron 1545 because it had stopped responding after the computer crashed while installing the drive's firmware. I have the same problem, however, with the new drive. It is not detected anywhere and if I try to install the firmware it says 'No compatible device found'. It is installed correctly, I can insert discs (it has power) but nothing else. I'm at the end of my tether here and can't find any relevant advice anywhere. Thanks for any help.