How to Reset your PS3 Video Settings
This is a real neat trick. If you have a Sony PS3 and you move around a lot, taking it to your friend’s place or a relative, you can normally run into a issue where you can’t connect it to a new TV or a monitor because the video settings are different than your basic configuration. Because of this, you can’t even get to the video settings screen which basically ruins the fun.
Here’s a tip that will save you from buying all kinds of different chords / wires.
1- Turn off the power of your PS3 and then turn it back on again.
2- During that, hold down the power button until you see something on the screen.
3- And that’s about it. What it does is, completely resets the video settings to 480p I think, the basic configuration, which enables it to work on any TV or monitor.
4- Once you get something on your TV / monitor screen, you can configure your PS3’s video settings to match the TV you are hooking up to.
That’s about it but you might have to go through the same procedure when you’re back home. But it’s worth it 
thanks good blog and post