I am having trouble getting my Sega CD to work properly. The system powers on just fine. The CD tray opens and I put a disc on it and it closes just fine. It starts to play the Sega Logo comes on the screen Sonic comes on a waves his finger and the Sega theme plays and everything and then.... Either the copyright screen comes on or the title screen depending on the game. It won't go anywhere past that. It's like the game freezes up or something. I've tried to get it to work with numerous discs but to no avail. Sometimes it works perfectly after some time of not playing it and then other times it messes up like this. I don't know what is causing this so any help would be greatly appreciated. Thanks