Hi everyone: My friend borrowed my Xbox 360. After playing Skyrim for while he called me and asked what to do when the Xbox started showing a message "HDMI Mode not supported." I really didn't know what to tell him because I was not using HDMI for my setup. I suggested to look for solution online. I don't know what happened afterwards, but yesterday he brought it back and when I plugged it into my TV (using the RCA cable, you know the Yellow, White and Red) the screen first started showing snow-like lines and then it stayed mostly black. I could hear that the Xbox was working, and I could switch menus (they were making familiar sounds), I could also restart it and open the DVD tray, but I couldn't see anything on the screen. I also tried toggling the TV - HDTV switch on the cable itself, but that didn't help. Can someone tell me what's going on and if there's a way to fix it? PS. I remember that right before giving it to him I installed the latest (now is Jan. 2013) dashboard update by logging in to my Live account. PS2. I tried resetting the display by holding down Y and right trigger while console loads. It doesn't do anything. The console restarts but the screen still remains black with these running lines across. PS3. I also have another Xbox 360 (without an updated dashboard), so if I plug it in using the same cable, everything works fine.