I have recently modded my 4.0u wii to do HBC, USB loader and DVD backups. I have been able to play everything I have done so far...except I have an Iron Man backup which will play on my buddies 4.1u wii that I also modded, but when I tried to play it on mine, the disk or the HD backup will load and go through everything including gameplay except the screen will constantly flash black and then back to the game every second or 2. Can anyone give me an insight on what may be causing this glitch.