By the way thanks to @MassExplosion213 I now have an idea about the rare and random black screens that get reported around. As I said a couple posts ago, when you format a SD card which had an emuNAND and install a different kind of emuNAND (say Gateway -> RedNAND or vice-versa) AuReiNand will still detect that old emuNAND. This is because when you format you only rewrite sector 0 (the MBR) and then a FAT table (usually at sector 8192, with the SD formatter). This means that the NCSD header will still persist in sector 1 (RedNAND) and in the middle of the FAT filesystem (Gateway), ready to be eventually overwritten by files. I can't really do anything to fix this.
Just FULLY format the card (overwrite the whole thing).
I found on mine that deleting the pre-patched firmware resolved any booting issues that I had with this.