I just got a copy of Virtua Tennis from eBay. I put it into my Dreamcast, it starts it and gets to the the game's main menu. But when I select any menu item the Dreamcast goes back to it's main menu. It does this every time. The disc has minor scratches on it, nothing too bad. The laser looked dusty, so I blew it off with compressed air which made it worse, it went back to the dreamcast menu after the Sega screen. So I cleaned the laser with alcohol and now it's back to doing the same thing described above. What can I do?