I have bought a used sega saturn. Thing is the saturn boots up fine to the main menu browser. When I try to put a saturn games into it doesn't seem to boot up at all. It spins fast then the disc starts to slows down then stops. When trying to the read the disc it the screen starts to freeze then the stars in the background start to freeze as wells. I've cleaned my saturn disc really. I've clean the saturn lens really well. I've also adjusted the laser screw. There are 4 white screw adjustments below left side laser, don't know what they do. I need Saturn help