Mac Pro rear usb sockets failed

Having tried to initiate a hardware test by inserting a Mac pro system disk and holding the "D" key down,
I lost my usb sockets on the rear of the machine so the sysem hung trying to find the mouse and keyboard.
I managed to break out of this loop by connecting both to the front usb sockets and the machine is running as before.
Is this permanent damage or is are the rear usb's retrievable ??

Does a smc reset fix the problem?

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