Check if your sd card has a folder called bootmii on its root. If that folder exists and has three files inside (armboot.bin, ppcboot.elf, and bootmii.ini) and your wii does not boot to bootmii automatically then bootmii is installed as ios. If there isn't a bootmii folder, then either bootmii isn't installed or you deleted the folder. You probably installed bootmii when you installed the HBC. Also, when was your wii bought?