If you are able to take keyboard out of laptop a lot of times it may be only a reseating of the cable on the main board (motherboard) depending on model of laptop. In my experience the toughest part is figuring how to take the case apart, once inside just trace the cable, usually flat cable, from keyboard to it's connector and reseat it (disconnect it/reconnect it) then test.
If this is intimidating (it can be) take to a pro.
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