Black screen on all games converted to ISO from WBFS

Hi, I use the USB Loader GX to run games from external hard drive.
The games I got in WBFS format I converted to ISO using Wii Backup Manager but all those games just show black screen in the Wii and the remote shows flashing 4 lights.
Edit:
Solved by changing to Force NTSC

Glad you figured it out. Now why on earth would you waste all of that drive space with the full iso? The wbfs files are so much smaller!