My iMac 2015 model is giving me a popup "USB Accessories Disabled. Unplug the accessory using too much power to re-enable USB devices" and none of the USB ports work.
Obviously I've tried unplugging everything from the USB ports. I also tried google searching the error. The advice I found was to unplug the computer overnight, which I did already twice, and I am still getting the error and the USB ports are still not working.