Start up problem --- freezes on last screen, no toolbar, no icons

Hello ---
Maybe someone can give me some suggestions.
I start up my Mac Pro, it goes thru all the startup screens but freezes on the final blue screen with only the Spotlight symbol in the corner. I have the spinning wheel and nothing else.
This started after I did the Mac Software Updates yesterday. It prompted me to restart and I did. Now I'm frozen.
Any ideas?
Thanks --
Drew

Always backup before updating.
then repair your main drive from DVD or backup or emergency boot drive.
Restart before doing an update, and don't use the system while the update is in progress.
You can often repair a boot drive through single user mode and running "/sbin/fsck -fy"
Clean out cache files and folders.
Rename the ~/Library/Preferences folder in Single User Mode to "Preferences.old" so it won't use it.
Try a SAFE MODE boot with Shift key held down. That might help, it disables your login items.
Usually there is a lot of disk activity on restart and login where cache files are loaded and updated and changes are going on.

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