I decided to set up my PS3 again, and then I go to turn it on. I get into a game and I noticed that the screen is too big for my TV.
I have an old TV so I don't know if that's what's causing it, but can this be solved?
It's possible you may need to reset the PS3's video settings:
This will make the PS3 re-set the video output source, and you will be prompted to set it up again for the current TV source. Follow the on-screen steps and the PS3 should auto-adjust to the screen margins