I just purchased the Roku Express+ Composite for my large main TV because the HDMI ports quit working. Once I got the Roku all plugged in and start following the setup prompts, it gets to where the "updating software" is complete and then nothing. The TV goes blank and says "no input". I tried over several times and even tried it on 2 newer TV's via the HDMI cable and get the same results. I do have an existing Roku Express that works great on my other TV's. Is this Roku unit possibly defective?