Default [Q] Failed 4.1.1 flash; please help!

Hi all--apparently I "softbricked" (or "soft bricked") my unlocked at&t s3 (SGH-I747) that I rooted since, after I factory reset and cache wiped my 4.1.1, I get passes on Odin whenever I try to install 4.1.1 again, which is all I wanted to do so I could try to upgrade to 4.3, but I never got that far. I just can't get 4.1.1 working again after a factory reset cache wipe.

What happens, now, is that my phone just can't get past the pulsing blue samsung logo after rebooting into any new 4.1.1 firmware I load with Odin (and I tried a few options--both stock SGH-I747 4.1.1 and the one here), or root66, but my phone just gets stuck on the pulsing blue samsung logo and stops there every time. Kies can't connect to my phone any longer, either, and it won't recognize my phone for a firmware reset, and my computer will no longer recognize my phone nor successfully install drivers for it when it's trying to boot (when I connect my phone in recovery or download mode, however, my computer will install a driver to let the computer see the phone, but I can't actually do anything with the phone after that--and Kies doesn't connect after the computer installs these drivers, either).

So, in sum: I can successfully flash 4.1.1 stock/alternatives with Odin ("pass!") but that doesn't get me past the pulsing blue samsung icon. I think I've tried to flash a new boot partition during this process, but I'm not sure. Any advice would be much appreciated, since I've been working on trying to fix my phone for a day and a half now without any luck

Slight update: I installed CWM Recovery (PhilZ Touch) and wiped again but after loading the 4.1.1 stock/alternative (above link) my phone--still--won't get past the pulsing blue samsung logo still.

Additional info.: when I boot in recovery mode after flashing the above root66 rom, I get the following errors:

E:failed to mount /data (Invalid argument)
can't mount '/data' (Invalid argument)

# MANUAL MODE #
-- Applying Multi-CSC...
Applied the CSC-code : ATT
Successfully applied multi-CSC.
E:failed to mount /data (Invalid argument)
can't mount '/data'(Invalid argument)
E:failed to mount /data (Invalid argument)

Also, I just noticed when I try to factory reset again it says this:

Formatting /data...
E:format_volume: make_extf4fs failed on /dev/block/mmcblk0p15
Formatting /cache...
E:format_volume: make_extf4fs failed on /dev/block/mmcblk0p17
Data wipe complete.
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/last_log
etc.

Thanks for taking the time to read this. I appreciate it very much. I honestly can't do anything until I get help here.