IMac won't restart after updating to 10.6.8

I just installed the update of Mac os x from 10.6.7 to 10.6.8 and I clicked on install and restart in system updater and my computer usually goes to the blue screen for a split second before it shuts down and restarts, well it stayed for more than a split second. I installed it at around 5, it's now 12. It hasn't shut down yet and it's still stuck on the blue screen. It seems to be stuck on the booting down process. Any suggestions? I'm somewhat computer savvy but use layman's terms please.

Hi,
A couple of things to try...
Firstly... use the Power Switch to turn it Off...
Then do a SMC Reset... Instructions Here:
http://support.apple.com/kb/ht3964
If you are still not happy... Download and Install the Combo Update:
http://support.apple.com/kb/DL1399
And it probably wouldn't hurt to do a Permissions Repair (using Disc Utility) and a Restart
Hope this Helps,
Cheers,

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