computer not recongising new devices through usb connecti

i have an acer aspire 7745 laptop and when i use the usb connections my computer does nothing it doesnt recongise that any device has been plugged in. troubled shoot installed new drivers and check devices everything says its fine please help
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More about computer recongising devices connecti
  1. What devices? does it do this every time? are your mobo drivers up to date? have you recently uninstalled/formatted anything? Has windows prompted you to install updates? etc.
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