For the late 2012 model at least, when re-assembling, make sure the edges of the plug are lined up with the innermost grooves in the case (there appears to be another set that is closer to the outside of the case).
Careful when reassembling. Don't make the same mistake I did by attempting to screw in the hard drive bracket without having the power supply re-inserted and aligned. Otherwise the screw will end up in the piece attached to the bottom of the case (where it's not supposed to be) and you will have no choice but to pry the glued part off the case to remove it. If you start to hear a "crunchy" sound when screwing, stop immediately because it's probably a glued part coming off.
Same here. I basically had to turn the Mac Mini completely upside-down (hence, "right side up" from the normal operational standpoint), then gently move the drive pins into place against the side of the case. Once they went in, then the antenna plate screws lined up nicely.
That is true if you do not need to remove the logic board (i.e. you are only replacing the drive in the original slot position).
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