Question: the 'k' key came off of my Presario! there are little fiddly white bits that seem like they are intact but... 

Answer: that happened to my presario too.  its a lil too complicated to explain it to you, but first examine the white pieces.  if they are not broken, you are fine to fix your laptop.  to place laptop keys back onto your laptop, see how the other keys work, and get an idea of how the white pieces fit together.  chances are that they fit like a folded up "X", and place that on top of the springy key (its a good idea to turn ur lapto off for this part).  place the plastic key on top of the plastics bits, and press down slightly hard, and see the results.  the keyboard works like a spring, the dot in the midle of the keyboard presses up, and the white bits keep the key in place and held down.  you can do it-fiddle around
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