MBP won't accept input from keyboard seemingly at random

Recently (the past couple of months) I have been having this weird problem with my 2008 MBP. I will try to input something using the keyboard (type in a URL in the browser, type in my name and password to give my kid extra time on parental controls, type a reply on a message board), and I can't type anything. I hear that little bong, bong at each keypress, like I am doing something wrong, and nothing appears. I will have to close and reopen Firefox (usually works), or just restart my computer.
Has anyone else had this kind of thing happen? It happens so randomly I haven't been able to guess what might be causing it. Thanks.

This is a bit of a wild guess. Try a PRAM reset. It can do no harm.
http://support.apple.com/kb/HT1379
Ciao.

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MBP won't accept input from keyboard seemingly at random

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