My ps3 was connected through hdmi cable but the input on my tv did not appear for some reason anymore. So I disconnected the cable I now I can't access high definition, it only works with the av cables. Please help, I already tried restoring the ps3 and nothing worked. And when I change the display setting to hdmi, the screen goes black and goes back to the way it is. I just want to know how to change it from av cables to hdmi cable. Thanks.