My 3 E D C keys stopped working on my laptop

"I know it's just 6 years later, but I had that same problem 3 (+4) E D C didn't work. I fixed it. The problem was in the connection to the motherboard. I got my notebook cleaned ""proffessionaly"":D and after recieving it the problem with the keypads started.
What I did was simply remove the keyboard (look how to do it for your computer on youtube) and then I disconnected the keyboard from the MB, cleaned both - the cable and the slot for it - and there it was a hair! After reconnecting it, everything worked out just as before."

"It’s a Common problem you can easily solve. Just remove your key board ribbon cable from the mother board slot and clean it. That will solve your problem. I just did in my Acer Aspire V laptop.
Good Luck"

Just had this problem. Luckily, the solution was simple. I popped out the offending keys using a delicately placed pencil. I then spotted a hair and removed it. Popped the keys back in and voila - good as new.