I just had a not so pleasant experience modding a Wii. I was following a tutorial (which I won't link to just in case it contains something that could be deemed illegal) and everything was going great until somewhere around installing Priiloader. I'm not entirely sure what or where things went wrong but I ended up with "Error autobooting systemmenu" when I rebooted the Wii. Fortunately I was still able to get into Bootmii to reflash the nand backup that I had made. I had loaded up Bootmii and selected the flash option and it said something about it being unsafe because it was installed as an IOS and not boot2 (I had no choice since it's a brand new Wii) and that if it failed it would pretty much be bricked. So on the screen it says "Are you sure you want to continue, KONANMI." or "press Z to exit." So I laugh and hit up, up, down, down, left, right, left, right, b, a, and it starts flashing!
Everything seems to be working now.