In device manager no problems for usb but doesnt work

Hello,
i have a question
i have an acer aspire 3810t, in device manager i did not find anu usb 2.0 errors, still when i plug in a device windows doesnt recognize anything.
dont know what to do please help
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More about device manager problems doesnt work
  1. Head to acer's support site and reinstall the chipset. Doing so will refresh the USB controllers.

    http://www.acer.com/worldwide/support/index.htm
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