Hi, I've stumbled on reports of this problem here and there, and having personally experienced it and fixed it, I can confidently tell you it's not normal, and it's not the hinge, it's the antenna bracket. Test first by removing the antenna and listen for the sound. You can somewhat compensate by placing the open MacBook keyboard down on a table and the display hanging off the front (the apple logo will be facing you), loosening the display hinge screws just a little and moving the lid about a millimeter away from the antenna bracket, then tightening the screws again. If this fixes the problem and you can live with the 1mm ridge you just created at the front edge of the MacBook, then you're in luck. If that doesn't resolve it or you want an invisible fix, and you're not concerned about warranty, then you need to remove the antenna and shave off again about a millimeter from a ridge that sometimes will interfere with the base of the lid's normal motion (see pic). You might be able to pinpoint the location of the clicks so the shaved areas are minimal. It's invisible unless you shine a light down the small opening between the bottom plate and base of the lid, and even then it's not obvious (that pic is through a magnifying glass). You'll want to click/zoom in on the pictures
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