Schneiderism

Whenever I try to play Big Dig through the Technic Launcher, it will load up everything (or at least I think it does), show the Mojang screen for a while, and then the entire thing will turn to a white screen and close itself? I have installed Optifine to no avail, and I have also tried deleting all the files and reinstalling them, and clearing the cache manually. None of these work. Anyone got any ideas?