UR12 is not showing up on my iMac at all

I tried opening up Ableton today and the software didn’t detect that my interface was plugged in, even though I had just been playing music through my monitors. Then I unplugged everything, replugged it all and now my computer doesn’t recognize that it’s plugged in entirely. The driver is up to date, and I’ve even shutdown and restarted my computer several times. Any suggestions?