Well that's interesting. I wonder if there's useful information in your forge log. Perhaps if you pastebin it someone will have an idea. I can't imagine what's wrong.
http://pastebin.com/ym0fbsa7
I think this is what you are looking for.
EDIT: so far it seems you cant disable tinkers construct. When I do forge says it is missing a mod. Is there some other mod that relies on TiC to be installed or something in that pack?
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