Prompt [Q]How can you Fix a hard Bricked Samsung galaxy S3 SGH-I747 ?

Hi I accidentally bricked my At&t Samsung galaxy s3 I had curruped the boot loader and now its not turning on at all can anyone help

The led light does not turn on the phone will register as a device on my computer but its unknown to my computer it shows up w/ some weard combo of #'s or something so I am pretty positive that I can fix it, I just need to know how

The version of android it was running was 4.3

so does anyone know how to fix this?