USB Ports are not working.

I have a trash can mac that has non functional USB ports. There is 5v at the ports but when any known good device is plugged into them it is not recognized. I already replaced the IO board and it did not fix the issue. Anyone seen this issue before and know what might be the cause? The unit works perfectly otherwise..

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The I/O part of the USB port is independent of the USB ports power services.

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