I purchased a used cMP recently and added a second optical drive to the lower bay, but I'm encountering a "stupid" issue: the lower drive door will not go all the way down, thus the drive tries to open but cannot eject the tray and then closes again. It seems the right side of the sliding mechanism (looking at the Mac from the front) is somehow blocked from sliding all the way down, whereas the other side does not have this issue. Just to clarify, it is not an issue with the BluRay drive itself - I've swapped the SuperDrive and the BluRay drive to no avail. Also, I have obviously removed the BluRay drive's tray front. I have searched the web for solutions, but it seems nobody has ever had this issue... Any ideas please?