Laptop keyboard not working at all?

I have a dell latitude D620 and the keyboard isnt' responding. When I hit the keys, it just makes that sound. I've disabled StickyKeys and everything, is there something else that someone did inadvertently that can cause this to happen? I don't think it is a hardware problem because the keys work fine... show more I have a dell latitude D620 and the keyboard isnt' responding. When I hit the keys, it just makes that sound. I've disabled StickyKeys and everything, is there something else that someone did inadvertently that can cause this to happen? I don't think it is a hardware problem because the keys work fine when I switch users and sign in under other accounts. A lot of kids use these laptops, so anything is possible. Our helpdesk can take days to respond, so any advice would be much appreciated!
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