I have a friend wii that he bricked and I hook it up to my tv and I get the black screen too. I was able to get it to boot to sd card with bootmii and that all it will do. If I trying to go to hb channel screen going black again. I checked the info on the system and it say 4.1U. does anyone nothing anything else I can do? Also before you ask preloader he has no backups and preloader not working.