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Reseat the keyboard ribbon cable - it may have come loose.
Or, if you inspect it, the ribbon cable pads may have become worn and you might have to do the trick of cutting off a bit of it at the end so that the ribbon connector makes contact with the ribbon cable pads further up on a non worn out part of it.
When you disconnect/reconnect the ribbon cable, make sure you do it the right way. Loosen the connector before pulling the ribbon cable out, or pushing the ribbon cable it. If you don't do it like this then this is what normally destroys the ribbon cable pads - as the connector pins will scrape against the ribbon cable pads.
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