I'm fully aware of how silly it is to be in this situation. I opened a thread thinking it was in the T-Mobile S3 forum and flashed the downloaded ROM. But regardless, I made an unfortunate mistake.
The ROM was Stockdroid 4.4.2 from the i9300 forum on this site. My phone is a T999v S3. Before beginning any flashing, I rooted and ran Odin to install Philz Touch 6 recovery and "T999VVLUEML2_T999VYVLEML2_T999VVLUEML2_HOME.tar.m d5". I was bouncing around firmwares looking for something that could fix the "Camera Failed" error (front camera works when charging but not anywhere else, any advice on that would be greatly appreciated), and I guess I lost track of exactly what I was downloading.
Anyway, after flashing the ROM the phone will not boot, and is almost completely unresponsive. The only life I can get out of it is when I connect it to the computer before taking the battery out, then putting it back in. A red light will shine at some point during that. In device manager the S3 is listed as QHSUSB_DLOAD. This leads me to think I can make use of one of the debricking tutorials on this site for the t999v.
The phone is a 16gb model, but I don't have a 16gb card. Before I go out and buy it, I want to know if buying it should solve the problem. I've read the debrick solution will not work with a 2gb card, but I tried anyway with no luck.
If it does work, great. If not, is my only other solution sending the device in for JTAG?
Thanks in advance for any and all help. I know this problem has been an impossible amount of times, but I wanted to pose the issue specifying the exact scenario I'm dealing with.