Did you system restore prior to the tea spill?
Odd thing happened yesterday. I was tapping away on my external USB keyboard on my desk, laptop up at eye level thanks to a makeshift stand (a couple of shoe boxes). I spilt my tea on the right side of the USB keyboard, but not on laptop, then all the keys on the right side of USB kb gave wrong output, e.g. I would hit "N" and get a "5".
So I disconnected the USB keyboard, and tried the laptop which hadnt been touched by my tea. Exact same problem on the laptop keyboard, as if it had caught or mirrored the injury to the USB board. Is that possible? Is it a Vista bug?
Restarts didnt help. AVG shows all clean. Only other unusual thing I did yesterday was install Chrome, which I love.
It was an old laptop anyway so I went out and bought a new one as I had to get on with my work.
But I'd love for someone to solve the keyboard mystery.

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