problem with Mac osx sierra with usb.there are solution?

problem with Arduino uno y Mac OS Sierra con USB port not recognized. there are solution? thanks

Are the drivers installed correctly?

What serial chip does it use (check the black chip nearest the USB port - should be either a 16u2 (like an official board, use official drivers), CH340G, CP2102 or FT232)

If it's one of the clones, search for the part number and "mac os sierra" on google to get the drivers, and install them.