Ok heres how it goes. I usually have my PS3 hooked up to a standard definition TV with the yellow/red/white cable. The other day i took my PS3 to my cousins house and hooked it up to his HDTV with a HDMI cable. when i turned it on it told me that it detected a HDTV and HDMI cable and told me that it could change some settings to make the picture better. I let it change the settings and thought nothing of it. The problem is that when i hooked it back up to the original TV i got no picture or sound. How do i get my PS3 to start displaying again.