mobile

Ok so I have a samsung galaxy s3 att and I have been rooted for the past month or so, no issues. Then, I decide to install a custom rom so I get a stable cm11 and attempt to flash it and it says my cwm version is too low so the reboot my phone so I can update it. The phone starts to boot and gets stuck on the att globe logo with the blue light pulsing. I shut off the phone, pull out the battery and try again, still nothing. I start getting scared so I restore the nandroid backup I made right before this custom rom incident and boot it, still gets stuck at the same place. I really need my phone fixed so can someone help me please??
I was talking to @sd_shadow on another forum earlier and was wondering if he could help me?