Three keys close to each other (o, l, and period) quit working on my Dell Inspiron 15 5000 series laptop which I have only had for two months over a year (no more warranty, of course). I gently pried the keyboard off using the indentations at the top, then wiped the area of the three keys that weren't working with an electronic wipe. After it dried I put the keyboard back on, making sure that the tape-like parts were snapped in with the correct side up. After that it worked fine, better than what the Dell tech person had me do (turn off, remove battery for a while), which only helped for a few minutes. No sooner was I off the phone with her when the problem returned.