I just inherited a Roku box from my parents that is around a year old. I took it to my house a few days ago, set everything up, and it was then working fine. However, after watching a couple TV episodes tonight, my television turned off suddenly and then kept turning on and off by itself. I unplugged both it and the Roku box and plugged them back in, but then it started saying that the resolution was mismatched and that I needed to change it. The only problem was that I couldn't even get to the home page on Roku - there was just a black screen! I unplugged the HDMI cable and tried it in both the HDMI1 and HDMI2 slots, but now I'm just getting nothing, not even the resolution error from my television. The Roku box is turning on, as the light is there and it flashes when I press the remote, but the TV is showing no picture. What can I do to fix this?
Edit: It works now with the component cables, but not the HDMI. I even went out and bought a new HDMI cable. Thoughts?