I'm having this same problem. I just tried installing Resurrection Remix, and it crashed, and now it seems like the internal SDcard is not functioning. I cannot boot. I can get into CWM or d/l mode though. In recovery, it will mount the external sd fine, but can't mount the internal sd, it skips formatting it every time because it can't mount. I tried installing Siyah kernel though ODIN, but it fails everytime after loading the boot. I tried re formatting partition in ODIN, but again, it fails. I tried reinstalling different ROMS off of the external SD card, but all they do is quickly show the boot flash, and then go straight to a black screen.