My brother got a dreamcast a few days ago. He also bought Quake 2 and Sonic for it, and it plays both of those games just fine. I bought Jet Grind Radio, and it won't play it. The game is in near mint condition, as well. When you put the disk in, it will say "Please wait, checking disc" and then it will start the game, show the "Sega" logo, and then return to the main menu. Can anyone explain to me why it is doing this?