Stuck on Samsung screen

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http://forum.xda-developers.com – I saw a couple people had the same issue that im now having but none of there solutions solved my problem i wiped my GS3 for ATT tried to go back to a stock with root rom and when it rebooted it now just hangs at the samsung logo at boot tried re-flashing via odin with no luck also tried flashing a CWM.tar since i cant get into stock or CWM recovery to flash from there is there something im missing i know its late and maybe my brain isnt working like it should (HowTos)