I have a qoob pro with a modded full size case. My gamecube used to read my backups fine when i used it like a year ago. Now on some of my backups it says unable to read disk when trying to boot the game in the qoob menu or goes to the nintendo error screen saying to shut off the gamecube and turn it back on. Some games play but have random lock ups. When I do a read test the disks pass fine but will not boot and gives one of these errors depending on the game. Also some times when it freezes it will make a clicking sound. It reads retail disks fine though. All my backups are full sized dvds. These are the same dvd backups i have used before with no problem. Also i am using the same firmware 1.3a that i used before with and had no problem. My wii reads these gamecube backups without any problems. Any help would be great thanks.