I'm posting this in the TWRP thread since this happened to me while in TWRP.
Well, it appears I managed to brick the unbrickable.
Understand that this is a long shot, at best. I would never recommend this under any other circumstance.
If your MOJO truly will not boot to anything at all, then something must be screwed up in your fastboot. If you open up your MOJO, there may be some possible way to reset your CMOS with a button, or maybe by removing the battery and reinstalling it. If it even uses a removable battery at all, I don't have a clue. Short of that, I don't know of any other way of fixing something like this.