I too am having the same issue that's been discussed on the last two pages. I re-virginized my Wii on 4.2u and tok it all the way back to out-of-the-box factory default due to having a tons of crap on it, then i re-modded using shadowsonic's guide and dumped a "fresh" NAND without priiloader installed. I then followed this guide and extracted the NAND dump as described, set up for UNEEK with a fat32 partition @32kb on my HDD and split the files as they were laid out on the tutorial. My file structure looks exactly like the guide, however SNEEK/UNEEK just will not load. It gives me a black screen if i try to load BootMii from HBC or it gives me an error from priiloader if i try to boot into BootMii from there stating "BootMii IOS failed to load".
SanDisk 2gb "Made for Wii" SD card
cIOSX rev19 38 (249)
Hermes' v4 202,222,223
HDD setup= 450gb NTFS / 20GB FAT32 @32kb clusters
priiloader 0.5 BETA
BootMii as an IOS