Stuck on loading screen in Yosemite please help

I just updated to Yosemite at first I was able to sign in but now each time I start I get stuck on the loading screen before this happens.

http://i.imgur.com/6T3Fz0P.jpg

Here's with -v

http://i.imgur.com/UDyHmi2.jpg

I've tried all the boot flags and at one point was able to get past it with nv_disable=1 but then it didn't work when I tried it again. Any help is amazingly appreciated, I've spent all weekend trying to figure this out and I'm so lost.

Here's my specs: Gigabyte GA-z68xp-ud3 mobo 3.59 GHz Quad Core Intel Core i7 Gigabyte GTX 770 GDDR5-4GB

submitted by Julienscherliss
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What is missing? Please comment to help!

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