If you'd be willing to provide some information and time, I'd be glad to try to help you!!
1) Have you checked the formatting of this drive: (y/n)
2) Which loader are you loading from: (e.g. Wiiflow, CFG Loader, etc.)
3) Is there an update for the loader you're using: (y/n/haven't looked)
4) Have you tried using this guide to "Softmod ANY Wii": (y/n)
5) Have you ever tried running DML before this issue started: (y/n)
6) Have you updated your IOS's: (y/n)
7) Would you be willing to use DML if you could still use your HDD as storage for your USB games? (y/n)