After installing Snow Leopard, my external apple keyboard does not work. Any ideas?

After installing Snow Leopard (v. 10.6.3), my external Apple keyboard no longer works. Any ideas?

The laptops are called MacBooks there really is no MacPro laptop.
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    +serial: 5B378048K+
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    +This would be greatly appreciated,+
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    Message was edited by: Mike Greener

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