My Roku Premiere (Model: 3920X S/No. 063052918889) worked OK for two weeks, but now I have a blank screen and no sound. I've tried different TVs and USB power units and cables, and I've used a tester to check the remote control transmits infra-red when I press a button and I've tried using a different HDMI cable into the HDMI TV input that my Amazon Fire Stick normally connects to and I get nothing. I tried using a paperclip on the reset button for twenty seconds and nothing happened, it's totally dead apart from the faint white LED on the front. I'm stuck for more ideas. Should I return it or is there anything else I can try?