Microsoft Xbox Repair Manual page 35

Another common point of failure is the little nub on the white actuator circled in green on the
right, that little baby needs to fit into the trough on the bottom of the tray outlined in green in the
next photo.
Also note the teeth on the far left of the actuator, it looks like there are some missing right? No,
that's normal.
Now with the tray completely out move the actuator so the laser assembly is all the way at the
bottom of its travel, line up the tray so the nub fits back in the tray and simply push the tray back
in the rest of the way. Reassemble the drive and test!
With drives that will not open, this is often caused by the white nub jumping the track. In that
case you may have to force the tray past the nub so you can get to the point where you can re-
align the drive. There is no really good way to do this and be careful because you can break the
nub off the white thingy and then you will have to replace that part, try to use the flexibility of the
tray to bend that away from the white actuator.
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