I'm not sure if this will help anyone, but I had to do some ridiculous junk to fix mine. Details: Xbox 360 S Vizio 37" HDTV (1080p) Basically, after 45 minutes of troubleshooting, I had to connect the Xbox to a specific port on my TV and then plug a specific cable into HDMI port 2. My Xbox had to be plugged into HDMI port 1. My HDMI-DVI cable (Used to use the TV as a second monitor to my computer) had to be plugged into HDMI port 2. If nothing was plugged into port 2, the Xbox would not show anything. If anything else was plugged into port 2, the Xbox would not show anything. If the Xbox was plugged into port 2 and anything (including nothing) was plugged into port 1, the Xbox would not show anything. MAKES NO SENSE. But that's what I did. Hope this helps. Oh and here's a few other things to try: Load up your Xbox with a cable that does display an image. Hold RT + Y on Controller 1 until the console resets. This resets the display settings. Try plugging it in now. Reset your TV display settings. Sometimes you can change the smallest thing, but ruin your display. Factory settings can fix this. If your old setup used to work, but you changed a couple cables here and there (or maybe added a new one) and now it doesn't work, try your old setup. This is what worked for me. See ya.