I'm perfectly content with Photoshop 5.5 upon my old Mac: the big blue plastic unit with the blue apples on the sides, but CD burners kept frying. I've purchased a MacMini with a built-in CD burner to resolve this problem, but don't know if this MacMini will take 5.5 or if I have to upgrade. Also: will a photoshop upgrade 'recognize' the layers created in 5.5? If so, which upgrade will 'recognize' this work created in 5.5.? Thanks for any help.