Unsupported usb device

When I turn the car on, the central screen has a message that says “unsupported USB device” the screen then goes blank and I cannot get it back on. This is regardless of whether I hit “ok” or not on the message. I have nothing plugged in. I’ve taken out the usb cable, the power in the cigarette lighter for my dash cam and I’ve taken out the sat nav memory card but it’s still happening.