Allright, to start with some good news: your wii hasn't been bricked. You mentioned that bannerbomb does not work. I would like you to back-up any files on your SD, format it and place the Bannerbomb and thehackmii installer on it again and run it. If it still doesn't work, please post a text file which contains a list of all the files you have on your SD card (and in which folder they are).
After we get the Homebrew channel fixed, we will run a syscheck to see what you did to your wii.