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USB Ports sometimes work and sometimes don't?

USB ports

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I have successfully installed lion 10.7.2 on my Lenovo G570 and everything seems to be working most of the time. When I boot into Lion, sometimes the USB ports do not respond when I plug in anything, though when I do plug something in like a flash drive, the light on it turns on.. so there is some sort of power coming from them, its just that Lion itself doesn't detect the device.
And then sometimes when I boot Lion, the USB ports work perfectly, but more often they don't work at all. It is a very annoying problem as I hate having to reboot my laptop every time the USB ports don't work and hope that they do at the next boot.
Does anyone know of a fix to this? Thanks.

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