The floppy drive in the PowerBook 500 must be aligned after being installed into the unit or it may not accept or eject diskettes properly.
To start the alignment process, start with the screw located closest to the display. With your free hand push from the rear of the drive towards the floppy disk insert slot located on the right hand side of the PowerBook.
While applying light pressure to the drive, tighten down the screw under the display then insert the remaining screws and tighten them down. The drive should be properly aligned in the PowerBook.
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