I'm currently using a Y-Cable.
The games appearing in the list is fine, its when I select a game and press start that the black screen appears, as I said usually 15-20 seconds. Wii games though start up right away.
I’m getting a 15-30 second black screen when loading GameCube games through USBLoaderGX. When using Nintendont it’s around 10-15 seconds.
I've tried reinstalling both USBLoaderGX and Nintendont as well as using a different HDD. Currently using a 2tb Seagate Portable.