Sure no problem. This is what I would do ( I am assuming you had GB before as you will need its bootloaders):
First, try to reflash team hacksungs rom one more time as i've seen in their instructions that it might take 2 flashes. So take battery out, sim and external card. Put battery in, go into recovery by pressing up and down buttons plus the power button, when you see the att logo, you can release the power button. Hopefully you can get into CWM and wipe cache, data and reflash the ROM (I assume you did this one time already). Let it reboot to see if this works.
If the above method doesnt work, my suggestion is to go to ODIN back to GB.
Go to :
[Stock ROMs](OneClicks Master Collection)+[Kernels (Stock & w/ CWM)]+[Modems] UPDATED - xda-developers
I would recommend to download I897UCKI2 as it has CWM already baked in. Download it and unzip in you computer. Open the program as administrator (make sure you have cappy drivers installed). Take battery out, sim and ext card. You need to go into download mode, so press volume buttons (up and down at the same time), but dont press power button. With them pressed, connect your phone to the USB to computer. Now ODIN should recognize it has been connected ( I think a green COM box appears). After that you should just start it and let it reboot and BAM! you should have GB KI2 w CWM.
Now after this, I would suggest either trying again Team HAcksung, or other roms , but make sure you read the installation. I am planning on going to either Turks v5 or Slim ICS. Let me know it this helps.