Usb ports are not working

None of my USB ports are working, I cant get into my computer at all. I checked to devices on another computer and they are fine. I have a Dell Optiplex 745 system with XP. Can anyone help
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More about ports working
  1. What do you mean by "i cant get into my computer at all"?
  2. Use the bios jumper on the mobo set back,enter fix it your way..:)
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