I just moved to a new location and set up my Slingbox 500. On my computer, if I sign in and click watch, the video appears for about 1 second, then goes black. However, the audio continues to work fine. I've confirmed that my HDMI cables are fine. I've swapped them out, and I've also tried using the same cables on other devices and haven't had any issues. So I don't think that's the problem. At first I thought maybe I needed to do a hard reset, but the fact that I have video for a moment makes me think that wouldn't fix it. Any suggestions?