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my left ‘shift’ key stopped working, and it is a nightmare because I use it allot. I followed all the basic recommendations of previous similar questions: system preferences>accessibility>keyboard/mouse trackpad as well as the dictation & speech are all in check (no special keys, no slow keys etc). Opened the keyboard viewer, and the ‘shift’ is defined properly, when i press the virtual key it responds but the one on the keyboard doesn’t (the right one does work). I pulled out the key and the inside looks intact, with a white silicone thing in the middle and two white frames that hold the key are in place. Had a little water incident near the computer, but I don’t think that any water got to the computer or the keyboard. Is this an issue of contacts or something? Anyone know how to save it? Thanks!

Can’t really save a liquid damaged keyboard ;-{ Once its damaged you’ll need to replace it. Now there’s two ways: The easier is to just replace the uppercase. Still quite a bit of work. The harder is to get a replacement keyboard and replace the keyboard alone after you’ve got the uppercase free from all of the other parts. Here’s the IFIXIT guide to replace the upper case: MacBook Pro 13" Unibody Late 2011 Upper Case Replacement and here’s the part: MacBook Pro 13" Unibody (Early 2011-Mid 2012) Upper Case. You’ll need to follow this same guide then follow this YouTube: 2011 Macbook Pro 15" A1286 Keyboard Replacement