to keep your cd drive working properly:

    1 position your server so that when the tray opens, it doesn’t bump into anything.

    2 do not leave the disc tray open. if dust gets on the lens of the cd-rom drive, the drive may have problems reading your discs.

    3 do not put anything (for instance, a cup) on top of the tray when it is open.

    4 do not force the tray open by hand. in an emergency, you can use an opened paper clip in the tiny hole near the drive to eject a disc.

    5 do not wipe the lens with a paper towel or other abrasive surface. if you need to clean the lens, see an apple-authorized service provider for a lens cleaner.

    you may want to open the tray and take out your disc before shutting down.