Sorry, at the Moment i can just use the small Editor (thanks to a bug in Firefox 3.6b4) so i cant quote!
You have to solder a lot of wires (more than 15) to a small points on your Wii. If you do it wrong or if your iron is to hot your Wii is a case for the trash!
The best way is to wait for a 4.2 Update on a Disc or send it to Nintendo.
Oh wait. There are Discs called Universal Unbrick Discs floating around somewhere (google is your best friend). Maybe those could help you.
Do you have anything installed on your Wii?
Do you have SuperSmashBros Brawl NTSC for your Wii (Original)?
Do you have Indiana PWNS Save on your Wii (and the game)?