With the case closed, place the Unibody top-side down on a flat surface. Depress the grooved side of the access door release latch enough to grab the free end. Lift the release latch until it is vertical. /Guide/Installing-MacBook-Unibody-Model-A1278-Access-Door/771/all#s4172 The access door should now be raised enough to lift it up and out of the Unibody. /Guide/Installing-MacBook-Unibody-Model-A1278-Access-Door/771/all#s4348