回答“Best Glue or Tape for Spacebar?”Please pay attention that the “transparent part” has an orientation and should not be reassembled with a 180° rotation (on the keys where that is possible). Working on the “enter” key (US Layout) I found that with wrong orientation the key will still work but making contact much less often and with more strength only.
回答“Replaced Battery no longer booting up stuck on Apple logo”SOLVED THAT. I made my mind that it's the grounding contact issue. I had exactly the same problem after replacing the battery. Tried everything with recovery etc. without any success. However, I was intrigued by the "grounding contact" issue reported by the first poster. In fact, I had noticed that pin, and remembered that I inadvertently had made it lose contact with the metallic box. So, I disassembled and reassembled everything again. Took care of correct positioning of the golden pin, and magic! Everything works! I have to say that I checked again all the connectors, so I can't be 100% sure. Period. That being said, though admittedly a bit paranoid, let me add the following: the correct placement of the ground pin is determined by how much you tighten the screw under the "Do not remove" label. If you tighten too much, the pin falls under the metallic band with a click, and looses contact. At that point, to put it again in the correct position, you must remove again the whole logic board. Again,...