Mouse not working on start-up.

Hi,
I've just bought a used powerbook, which seems mostly fine.
However, when I boot up and the sign in screen comes up, the mouse is not working. If I remove and refit the usb plug, it then works. It seems like the usb is not being scanned.
Anyone heard of this, or have any ideas.
Cheers.
Wayne.

Welcome to the Apple discussions.
With USB problems, a power management unit (PMU) reset will sometimes fix them. Follow directions at http://docs.info.apple.com/article.html?artnum=14449

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Thanks for the information, that is exactly what I needed.
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