Every car at the start - Gran Turismo 5 Prologue
Every car at the start
All that you have to do is go into options, go to steering controls than wait 50-55 seconds than press down right right down right right down right right than start. You shall return to the top of the options and go to secret, game settings than put kiosk mode ON. Put all favorite cars on and you should have them.
Please do not be rude to others, what may be obvious to you may not be to the person asking the question.