Guides I've Contributed To
MacBook Pro 15" Core 2 Duo Model A1211 Hard Drive Replacement
When re-attaching the upper case, you will see small plastic clips along the front edge which need to seat into receiving clips on the lower case front edge. It is these clips which sort of "popped" loose when removing the upper case. You need to apply firm pressure for these clips to reattach properly, and you will hear a click when they seat into the bottom.