Hi,Since a few months I am spending more and more time behind my computer.Little by little I am also understanding how everything works with the 737-700.Everything is going perfect until I start my descend (whatever the destination is).Sounds fades away,2-3 seconds black screen and then computer returns to desktop....flight finished and you have to start all over again.Can you help me finding out what is going wrong every time?Thank you in advance,Serge

Check the Sticky posts here in this forumn talking about CTD's. I believe there is an answer to your problem there.