That's exactly what mine was doing as well (quick scan, then shuts off), but now it will not boot at all. So original problem was no wifi; now it will not boot at all (but I can still flash it via Odin or Recovery Mode.)
When you ask, "did you odin EVERYTHING (modem, kernel, rom) back to stock or just the rom?"
Not sure, I guess just the kernel. I've been flashing only this file to get it to stock: acs-eb30-stock-kernel-pulled.tar What else would I need to do to completely re-stock it?
Thanks for the help all.