I bought a uesd Wii today and cannot get it to work. When I turn it on the green power light comes on but the TV screen stays black. There is no picture or sound. I have checked all the power supplies and verified the tv is set up corrrectly. I have another Wii that works perfectly with the same cords and TV. I am just swaping out the Wii consoles and the new one is not working. The light inside turns on and it will take a disk and eject it but nothing on the TV, that just stays black. Please help. Thank you.