have you a spare GC controller? If so you could try the FREEsavemii while you wait for one to arrive. This will let you know exactly if you have a brick. Open the controller up (you'll need a triwing) and plug the controller into port 4 on the wii. Now, I've never tried this, but you can search around for better instructions; hold down all the d-pad buttons a the same time and start the wii - look around for descriptions about how to do this successfully, I've heard people say you have to do it various specific ways. If successful you'll get a recovery menu I believe, then you maybe able to do something.
anyway, this is just the same as what the savemii will allow you to do.
Sorry you've had bad luck mate, hope this helps; it's not much, but it's worth trying
PS, just thought, you'd need a disc with a higher firmware update on it for this proceedure to "repair" your wii- sorry