Flip the Apple TV over so that the bottom of the unit is facing up.

You need to remove the rubber base to get access to the screws.

Starting at one side of the device, use a hairdryer or a heat gun to soften the adhesive holding the rubber base in place.

The rubber base will be hot after heating, take extreme while proceeding.

While the adhesive is still warm, peel the bottom of the rubber base upwards to detach it from the metal plate.

Repeat the procedure described above until the rubber base has been completely removed.

Remove the four T10 Torx screws securing the lower case to the upper case.

Lift and remove the lower case from the upper case.

Carefully pull the hard drive data cable straight up from its socket on the logic board.

During reassembly, make sure the hard drive data cable is firmly seated in its socket on the logic board. Otherwise, during boot-up you will see a flashing question mark "?".

The fan is held in place by three rubber posts.

Using a pair of tweezers, squeeze the top of each post and push the post down into the hole. Repeat for all three posts.

During reinstallation, it helps to lubricate the rubber posts. Try weaving a string through the holes in the posts to pull them up through the mounting points.

Do not excessively pull on the posts, as they may rip.