blue led, black screen after trying to root

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http://forums.androidcentral.com – im having some problems here. Ive rooted my past phones, and this phone before. ive unrooted it twice now to do the past two ota updates from tmobile. i did the 4.1.2 update a few days ago and now i need to re-root it. i have NO idea what i did wrong, but ive followed the same guide i always use, i used odin 3.07, did it just like the other times, but now when i reboot, it plays the song, but the screen stays black, and i have a blue led on. any ideas at all. (HowTos)