My G4 powerbook has been saying recently that the start up disk is full, so i tried to empty some stuff off it. But not long after this when i tried booting it up the normal happens at first ie the t'ing' start up sound and the apple sign with the little timer going round but it does nothing else, it just carries on going round. I have tried re setting it and looked on help sites like this to try and override it etc but nothing seems to work! Please plase can anyone help? I am lost with my powerbook and can't find a repair shop locally!