usually when moving server, all folders got copied.
the white page issue is almost always a template/cache problem.
there is a cache rebuilt option in the style section, it also create a css cache, but needs to be done for each style that is added.
so there is a template cache, a css cache, and the cache for viewed pages (cache of the filled templates).
Try to switch default style and look if the problem is there too, if needed you can create a child style wich requires also automatic rebuilding of templates.