Balck Screen from Monitor Cord USB/Firewire

I was working and suddenly my Mac monitor went black. The only way I can make it (my monitor) work now is not to plug in the Fire wire or USB cord coming off the monitor cable into my Mac. Of course I can work without these but I won't be able to use the USB or Firewire connectors on the back of the monitor. Any clue as to what is causing this issue???
Thanks in advance!

I forgot to mention that other devices work fine when plugged into these ports.

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