I have a vaio vgnsz460n and recently, it just completely shut down. The DOS screen shows, but afterwards, it will not continue into Windows. I cannot even access the vaio recovery center. Recently I purchased the recovery discs, and often, the computer does not even recognize the disc is in there. On the times that the computer does recognize the disc, I can get into vaio recovery center. However, when I attempt to restore the complete system, I get an error message "could not select disk." Does anyone have any idea what may be wrong, and what I might be able to do to fix it?