I recently managed to mess up my Mac mini while resetting PRAM and NVRAM. I did reset them indeed but something got corrupted because the mini would hang at the blue screen with the spinning beach ball re-appearing time and time again. Strangely I could still connect to it with SSH and file sharing worked, too.
I tried lots of things such as resetting the System Management Controller (SMC) and booting from the Snow Leopard install DVD to verify and fix permissions/disk.
I found an interesting post in the Apple forum from someone whoes log file showed the same type of errors:
Login Window Started Security Agent
Login Window - Returned from Security Agent
AuthorizationRef returned errAuthorizationDenied. Exiting.
The post mentions a “corrupted authorization file” but that didn’t help me much (where is this file?). Googleing for that lead me to a blog entry labeled “LoginWindow crash” which explains things quite detailed. A second hint came from the insanelymac.com forum, thanks.
In the end you need to replace the authorization file at /private/etc/authorization with either
- authorization~previous in the same folder
- or the one from the OS X install disk at /Volumes/osx/private/etc/authorization
10 thoughts on “Mac hangs at blue screen (login window crash)”
Thank you for this info, it helped me solve the same problem!
You absolute beauty!! I’ve been trying to fix this damned thing for the last two and a half hours now. Finally managed to work out it was the loginwindow, then that the authorization could be broken and then I found this post which told me where the thing was! Copied over the authorization file from my MacBook and hey presto! 😀
You’re a life saver!
Many thanks for the tip! I was thinking on reinstalling all the system before I read your blog! 😉
Thanks! Sainthood abounds!
Thanks! This info saved me, too.
Thank you so much! I have searched for solutions everywhere and all of the suggestions to solve the blue screen problem didn’t work for me. Thankfully, I viewed the log file and saw the error you mentioned, googled it and found your site. It solved my problem. I saw another file authorization,(comma) and used that. Now my macbook air is back to normal(a guy from apple service center suggested to replace the logicboard, thankfully i didnt follow)
IT WORKS!!! THANK YOU VERY MUCH!!!!
I lost 2 hours to resolve that problem before I found this post.
thank you again
I just wanted to say thank you. Thank you so much for this information! It really helped me out a lot. While actually finding an operating system that would both mount my OS X HDD as writeable and also show all files was a huge pain, your information was 100% spot-on, and I cannot thank you enough for the help that you provided. My Snow Leopard installation now boots successfully again.