Daft question, I know, but have just got a new iMac and need to replace my old USB 2 dock with a USB 3 one. The USB C docks look useful, with HDMI ports and audio ports in addition to USB ones but they seem designed for laptops and I wonder how much power they supply? Could the port rom iMac charge an iPad through the dock or power an optical drive? Some of them can take a MacBook power supply over USB C, which brings me back to original question? Would connecting a MacBook power supply damage an iMac?