Same problem here:
I backup al my kext and the kernel via OSX86 Tools before to start the upgrade via Appstore.
I think was a good idea in the case audio or something around doesn't work after the update BUT instead the system hangs TOTALLY and don't let to boot in any way.
I tried -X obviously but the system hangs in each case
Can anyone help please?
I'm using MSI Z77MA-G45 and all was working fine on 10.8.4: imessage, icloud, sleep, video hardware acceleration... all, all was damn working excellent!!
Who damn blinded and pushed me to upgrade to this 10.8.5 ?
No time machine backup and I would like to avoid a fresh new install because I've tons of software installed like the full creative cloud suite, a lot of session saved, thousands photos and personal videos that I can't download because are personal, self made...
Backup all this data and re-install is a titanic action so I would repair my boot error:
PLEASE, HELP!