Got a Dreamcast that won't read most games, and we're not sure what exactly to do. Majority of the time it just takes us to the menu screen and asks to insert a disc, while few instances we'll load and freeze {usually with a black or white screen.} We're looking for a "new" one, but until then, we'd like to see if there's anyway to salvage the dear old thing. The only games that it'll read are Sonic Adventures and one or two demo discs, and none of our games are scratched. Help?..