When you turn on the PS3, HOLD down your finger on the power button (the one that turns it on/off, NOT the switch in the back) until you hear a second beep while the console is turning on.
It will completely reset your display settings. I have an HDTV and a HDMI, and whenever I switch from one to the other I HAVE to do this or I get no video on screen.
Answers & Comments
I'm guessing it's the PS3.
When you turn on the PS3, HOLD down your finger on the power button (the one that turns it on/off, NOT the switch in the back) until you hear a second beep while the console is turning on.
It will completely reset your display settings. I have an HDTV and a HDMI, and whenever I switch from one to the other I HAVE to do this or I get no video on screen.