I purchased a mcboot memory card for the my ps2 it's the phat one. And I play gran turismo 4, and I'm having great difficulty managing how to get the cheats to work, I've been on YouTube and Google and yet still no hope, I selected the game I whant then the cheats, and then start game put disk in in selected yes to start game and then, it when to a different screen, when to mc1, then, boot, then booted up another file waited for the game to load and found out that the cheats I selected didn't work. Do I have a saved gt4 game is that the reason, do I need to start a new game, or is it just for arcade mode not gran turismo mode. If any people can help me I'll be appreciated if any body can. Would I need to find new codes and enter them in which I have Done but still nothing. If any body can help me with my issue. A really big thank you to everyone. Sorry for making this a long read.