I&#x27;ve never seen any Chromecast advertising that implies it only gets power over HDMI. All of the media on Google&#x27;s Chromecast site show either both HDMI&#x2F;Aux and USB plugged in or nothing plugged in. Pretty much any TV now has a USB port whether it be for media playback or for updating the firmware of the TV on older ones so its not a huge deal to have to plug it.<p>Even the first release of the device clearly mentioned it needing USB power. <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=YRu18f2GRQo&amp;t=41m22s" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=YRu18f2GRQo&amp;t=41m22s</a>