Apple Keyboard: Tab, Caps Lock, Tilde and Esc not working.

Yesterday I turned on my mac and was filling out some form and discovered whilst trying to go the next field that my tab button wasn't working. My tilde, esc and caps lock buttons won't work either (light comes on when I start up and pull out and plug keyboard back into USB port). It's strange that they're all tucked up in that left hand corner.
Has anyone else come across the problem or have any thoughts about curing the problem?
Cheers,
Mike

If MGW's suggestions do not work, then check out the following as your keyboard may be dirty:
Disassemble a Apple Pro (transparent) keyboard to clean it
http://technology.niagarac.on.ca/people/bgracey/prokeyboardrepair.html
http://www.tuaw.com/2006/11/17/how-to-clean-your-apple-keyboard/
http://www.associatedcontent.com/article/367670/cleaningthe_apple_pro_keyboardremove.html?cat=59

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