Instructions
Press the "PS" button on your controller one time. If the on-screen menu appears, highlight and select the "Quit Game" option to close out of the frozen game. Select the icon for the game again in the "Game" menu to re-load the title that was previously frozen.
Hold down the "PS" button on your controller. Continue to hold down the button until the system menu appears. Select "Turn off the System" from the system menu. This will completely turn off your PlayStation 3. Press the "PS" button again to turn the console back on. Try to play your game again.
Press and hold the "Power" button on the front of the PlayStation 3. Hold it down until you hear two beeps, at which point your PlayStation 3 gaming console will restart itself. Select the icon for your game from the "Game" menu on screen and attempt to play again.