to commonly asked questions.

Backup questions

Installed latest update and this is what I am looking at for 2 hours. any ideas?
There are many reasons for this.

The update went bad during installation.
hard drive died during installation.

First thing to try is just holding down the power button forcing the computer to shutdown the try to restart. If that doesn’t work, you’ll next want to boot into the recovery disk partition and check the disk if you can. You may have to reinstall OS X from there.
This image is a theme.plist hack