Hello I just got a defective box off ebay, seller claimed untested because of no PSU. Tested it, it doesn't go RROD or anything, everything stays green, I got two problems though: The controller doesn't synchronize properly, it stays blinking, but I can start the console with it. Second problem: I don't get any sound or pictures, neither by using an HDMI cable nor by using the original cable. Both work good on another box. I have opened up the box to see what the previous owner did to it just to find soldering traces of an RGH. Any ideas what I could try to revive it? It acts like my other fully working box when I don't connect it to a TV.