that sounds like using flashdrive instead of HDD
that sounds like not using wii backup manager but putting games manually on your usb even after being warned about possible issues like reboot or black screens in another thread
could also be wrong usb port (if no other games are working)
trying emuNAND is not a solution, but an option. it's not a way to fix a game (on the contrary, it can break them, look at your previous thread about zelda !).
Please, don't make a new thread for each game problem !
use the same thread to fix all your problems and post all your games in the same one.
it's probably just (and always) the same issue for all of them. no need to get 4 times the same help in 4 different threads.
use wii backup manager !
why do you still ask for help when you don't follow them?
don't do things YOUR way, do it the correct way!
adapt to the way you should do it, and don't expect the tools to work the way you want to use them.