This is a repost of something madbrad21 posted on the tracker a few days ago, I figured it was really helpful to have so I'm reposting it here, thank madbrad for this, not me
If you've got none of those (sometimes you won't if it's crashed in the launcher before starting minecraft), you can find the launcher logs by clicking on the cog in the top right of the Technic Launcher and clicking the logs button. The latest file is usually the one you want.
Once you've got it, you can paste it here; http://paste.ubuntu.com/ and it'll give you a link which you can put in the forums (that makes reading it easier for us and also allows you to paste large amounts of info which you can't do on the forums).
If you've got a problem downloading a modpack (including attack of the B-Team). You'll find the most help here; http://forums.technicpack.net/tracker/project-1-technic-launcher/
If you can download it but not run it, you can find help for that here; http://forums.technicpack.net/tracker/project-4-attack-of-the-b-team/
If you can run it but you're struggling with something actually in the game, post here in this forum
