Macbook freezes when charging

Hi,
I have a white unibody macbook (late 2009 model) ; It functions normally when being used. However, when I have put the macbook on charging and if not used for long time, macbook freezes. Only mouse cursor moves but nothing happens. Everytime, i need to hard boot to get the system back.
Don't see any activity on the hard drive and also, the CPU is normal, the fan speed is normal.
Tried PRAM reset but didn't work.
Any suggestions that could help to identify the root cause.
Thanks,

The problem is that there aren't any drivers for the MacBook that are compatible with Windows 8, so you will have to wait. I haven't heard freezing on the final Windows 8 version on MacBooks, so it looks like the final version fixes that problem

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Macbook freezes when charging

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