I have the same problem, been in verbose mode but can't quite figure out whats wrong. It works a few times but then no longer boots off the ssd, so given up and using usb, strangely seems to boot much quicker off there anyway, and iMessage works as well(not that well, says x is not registered with iMessage, although will randomly start working after a while), so will probably not bother with the hassle. However, I think the problem may be to do with dual booting, though not really sure why, if you figure anything out, please let me know. Thanks!