Phone wont Boot

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http://forums.androidcentral.com – Hello, The other day I decieded to Root my Samsung galaxy s3 (GT-19300) (International) running 4.1.2, and then my phone was going great until I decided to install this application called: Chainfire3D (https://play.google.com/store/apps/d...ire.cf3d&hl=en) After the application installed, my phone went to reboot, but was stuck at the Samsung Galaxy S3 GT-19300 text logo. the phone stays there, and does not get past this point. could someone tell me how I can get my phone to turn on again? as I am really scared, and I am not sure if my phone is broken or something. thanks for (HowTos)