After installed Mavericks, reboot, screen freezes at Apple Logo

[mahol]

After installed Mavericks on macbook air early 2012, reboot, screen freezes at Apple Logo. I have run check disk and all in order. I can login on safe mode with no problem. any ideas? thanks

 

[Manic Harmonic]

Boot in verbose mode (command+v) and see where it freezes. It's probably an incompatible kext.

 

[mahol]

in verbose mode is not stuck. after is stuck on Appe logo....

 

[KdParker]

If you haven't fixed this yet these steps should help:

1) Login using single user mode

2) mount -uw /

3) rm /var/db/.AppleSetupDone

4) kill -1

Restart and set up a new admin user and then change password to get into your old user.