Oh I see. Sounds like something wrong with gx. Here is a guide preparing and installing gx.
Click here for useful links
Softmod any Wii guide Yes ANY Wii!!!
FAT32 Hard Drives - Formatting, Loading, Ripping, Playing (recommended USB setup)
Ultimate List of Troublesome Games & Solutions
The Noob's Guide To Getting Help
How to Run & Post a System Check
Blackscreens & Freezes - Causes & Solutions
Try searching with this!!!