Need to install a new rom from SD card, CWM-Recovery can't see the SD card files

[AC Question]

Phone is a SGH-I747M. Was rooted. Tried to put a custom rom on it. Something happened. Now it loads to CWM-Recovery v5.5.0.4. I can't view the files on the SD Card. I have tried mounting the card from the menu. Still nothing. Please help. I think I can save this phone, but I just don't know how.

Odin doesn't recognize it and neither does my laptop when it's in the CWM-recovery mode.