I have a QS 800MGZ, running 10.4.6 , 1 gig memory and 2 HDs, lately it has refused to shut down, it goes through the steps until it reaches the blue screen with the segmented circle spinning and remains there. I have run Applejack and Cocktail and it has not made any difference. Any tips or help would be appreciated. Thanks Hector I. Macedo "Lord of the Flies" Dallas TX 75248 hecmac at comcast.net