The important thing to realize here, and why people have so much trouble, is that if you stick the card in, you're capable of hitting a springy latch WHICH IS NOT THE LATCH YOU NEED TO HIT. As someone on another site has pointed out, the latch in question is a thin bar just inside the opening, not the thing you can hit farther in if you stick the card in by an inch or so. You can only hit it when properly exposing all the screws and pointing a card up toward the Apple logo.