オリジナル投稿者： Dan ,
Lets try a different tack here. Do you have a bootable external HD with Snow Leopard on it or the DVD? If you do try starting up on it and then jump over to your HD and see if the apps still work (focus on iTunes for now). Let us know what it does. Also make sure you have backups of your Apps & Files as you may need to check out the HD for some corruption.