It would be helpful if you explained what you did to you wii, what did you install, what did you uninstall, what guide/guides did you follow. What firmware you were running, do you have boot2 bootmii, do you have preloader, mod chip, can you savemiifrii with gc controler, etc. The more info the better.
I won't nit pick, but this is in the wrong section. Brick issues would be more appropriate.