Ok seems that a lot of noobs ask me about a black screen at usb loader GX. This may occur in some cases:
1)ARE YOU SURE YOU DID THE ABOVE CORRECTLY? If neither neogamma nor usb loader launch correctly, then steps B adn C were not done.
2)ARE YOU SURE YOUR HDD IS COMPATIBLE WITH WII? Check this here
3)ARE YOU SURE YOU ARE USING THE CORRECT USB PORT? The correct one i the one at the side of the SD card adapter, the outer one, not the inner one.
4)ARE YOU SURE YOU FORMATTED THE HDD WITH WBFS MANAGER? Here it is
5)ARE YOU SURE YOU PARTITIONED THE DRIVE CORRECTLY? If you have more than one partitions, make sure the WBFS one is the first in row, primary and active.
Consult Gen3sf 's guide for usb loader for more details!
At the time it loads, see these for the settings : USBLoaderGX settings