That's what happened when we replaced our photo printer. Installed it in the same port the old was plugged into and then the Webcam stopped working. By the time we were finished it was like musical USB ports they all moved over by one until they all worked.

This was my wife's machine and all 6 USB ports are being Used.
What a reboot. all the handshaking, it's like a town meeting in that box.
Wayne,