IMac wont recognise keyboard and mouse

Hi
I have a strange problem.
When I am trying to start the computer, Leopard does not recognise my keyboard and mouse.
When i press the power button on the machine the optical light on the keyboard comes on, however as soon as the apple logo appears it goes off. The machine boots to the log in screen, however I cannot log in. If I move the mouse to a different port, the light comes back on, however still does not work.
What is really strange is if I boot in bootcamp, the keyboard and mouse work fine.
Both keyboard and mouse are connected directly to the machine.
Any ideas?

I have the same problem and the same Imac.
Really i don't no what to do.

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