Keys on external keyboard not working

Hi folks,
I recently purchased a USB keyboard (extended numeric) for my MacBook Pro, and all has been good until this morning, when the V and Y keys (both lower and upper case) have stopped working, i.e. when I try typing with them, nothing appears. With the V key, the Edit button flashes, and nothing happens (that I can notice, anyway) when I try the Y key. (Thankfully my macbook keyboard is all okay.)
I wondered if the keyboard might have shorted, but all other keys are working okay.
Any thoughts?

Yes, the built in keyboard works perfectly well, both with the external keyboard connected and disconnected. I'm hoping the external one isn't beyond help... it's such a pain to have to replace!

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Keys on external keyboard not working

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