How to troubleshoot i/o ports in a motherboard

my i/o ports dont work at all, no power, nothing in keyboars or mouse, no bios hence.
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More about troubleshoot ports motherboard
  1. does the windows splash screen show up or the bios splash screen?? if not then your looking at a power issue with the mb. if the system power on by has a error of not seeing the keyboard and mouse. could be a bad usb device hanging the mb or the usb ports on the mb are burnt out. i would try another keyboard and unplug every other usb device and see if the pc will post with just the keyboard.
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