USB on Cinema LED kaput?

So I have this great Cinema Display which has worked flawlessly for over a year. Has 3 USB ports on the back. Use one for the keyboard and the other to recharge my iPhone.
All was well today until I decide to clean my office and was shifting things around as I dusted.
Now, none of the USB ports on the back of the display are working.
Don't know if I did something while slightly moving things around but I've checked all connections and everything seems fine ...
Is there a utility I can run that will determine if these USB ports suddenly went kaput?
Anyone have any ideas as to what may be the cause?

X423424X wrote:
Use a different USB socket on your mac.
Plug your keyboard into one of the USB ports on you mac to see if the usb is working at all.
Try smc reset.
I have the keyboard plugged into the USB port on the front of my CPU at the moment and it is working fine.
Plese explain what a "SMC reset" might be.
Thanks!

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