Possibly a bad motor in the drive unit, a bad sensor, or crud in the gears/rails. It depends on what “it takes it all the way” means — are you pushing the disk in? Does the drive close on its own with no disk? If you’ve taken the drive unit apart and thoroughly cleaned and lubricated the moving parts, it might be time to look at a replacement.
Worked like a charm - these instructions were spot-on. Watch the grommets on the antenna grate (that cushion the screws that hold in the original drive) and the spring underneath the cowling screw. Nice product, and I'd _highly_ recommend getting the toolkit!
