It's possible you just have a bit of dirt, lint, or some other contaminant underneath a few of the keys. Try blowing them out with compressed air before you look into replacing keyboards or other components. If the individual keys can be removed on your particular model, carefully pry them up and wipe down the contacts with isopropyl alcohol. Allow them to dry before you reassemble. If neither of those things helps, look into some of the culprits that James mentioned.
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When i received my laptop all of keys on the keyboard worked perfectly fine, but one day half of them stopped working. Now I have to dd n extra keyboard so i can use my laptop. Why is that?
crwdns2934271:0crwdnd2934271:0 Preety P. crwdne2934271:0