External Screen

I have a Dell Inspiron Mini 10

I am trying to run an external screen,as the main screen is to small.

I hook up screen,readjust the display output to my external screen.

It starts up ok, through login, until my mini readjusts itself, then all I get

is screen picture and none of my icons.

I've reloaded the drivers, readjust the display settings,,  and still nothing.