OK I think I've finally done it. I installed a media player .wad via the homebrew channel and on reboot I got the infamous "Wii System Files are Corrupted" after the power on warning screen. Unit does not have a drivechip in it though I am able to use the GC hack and get to the loader screen. I believe Bootmii was installed as an IOS however this doesn't seem to be much help as I did noby Majestyk - FixMii