Nonfunctional USB ports could be caused by a few things. If the ports are front-mounted, make sure the internal cables are connected properly and that the requisite USB header is enabled in your system BIOS. If the ports are soldered on the motherboard (and enabled), open up Device Manager and see if any USB root controller or hubs are reporting a problem. If so, a driver update/reinstallation may resolve the issue.
It’s also possible that the physical connectors have been damaged (or a fuse has blown), in which case you’ll have to re-solder some new ones onto the board. If the USB ports are associated with a third-party controller, be sure its drivers are installed, because Windows may not recognize the controller automatically.
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