Sorry for making a new topic for this, but nobody replied in the other one I made.
A few days earlier, my Dreamcast didn't read any burned games. Official games worked just fine (except for Sonic Adventure 2). After calibrating the laser the burned games now work again and the official games still work just fine, but Sonic Adventure 2 still doesn't work.
The game actually does boot up, but it never goes past the Sega and Sonic Team logo's. The screen will stay black. After calibrating the laser there is actually a difference. The game now also shows the SA2 logo intro, but without sound. After that, the screen stays white (or black if you skip the intro).
The game is an official copy and is in perfect condition, so what causes this? Is my laser still not good enough, or is my copy broken?