I wish I never would have tried to root my phone in the first place, but I was trying to root my AT&T Galaxy S III so I could get Jelly Bean 4.2.1 on my phone. So I installed Odin version 3.4 not thinking that I needed version 3.7. So I was able to install the Odin onto my S3 and then I moved to installing ClockworkMod but after I installed it and hit reboot my phone never came back on. I am able to access download mode and the mod menu still. But I was trying to fix it and installed the stock android flash .tar and that took away the mod menu but my phone still won't turn on, it just vibrates displays Samsung and repeats. Please help!!!! I don't know what to do!