PS3 Problem

So,I was at my friends house and I brought ps3 for fun even if we already had one
When I turned on my ps3 it asked me for graphic configuration etc and before I went home I forgot to put my tv config...
and now all I see is blank screen

I got one option:
Go back to my friends house..
Is there any other option? :S

His TV: 1080p
My TV: 720p

Uhm
Have you tried force restarting it?

Plug it in with default av chords. Then re-setup your screen resolution.

Press the power button for 5-10 seconds until you hear a beap to reset video configuration which is to return it to default settings