I have tried all the starting modpacks and none will give me any sort of minecraft window. The launcher will load for +5 minutes and minimize then reopen saying the game crashed.
Usual area that takes the longest to load is "Grabbing org.scala-lang.plugings:scala-continuations-library_2.11:1.0.2"
Blightfall Crash Report: http://pastebin.com/QicW8vkL
Launcher Log: http://pastebin.com/Hr5j03Hz