You could start by not advising other people to format their hacked Wii's so that they brick themselves the same way.
Formatting is NOT how to restore your Wii to a virgin state, and I'm not even sure what formatting exactly did so I can't say how badly you bricked yourself. Also installing a system menu wad at this point may be dangerous if it doesn't fix the problem as I think it would also get rid of preloader and then you'd pretty much be totally screwed.