My mac mini doesn't shut down after installing mountain lion?

Right after i installed mountain lion and checked all the new features, I closed all applications, clear ram, clear cache, clear print queue, made sure that nothing was running when i logged out(only one 1 user was logged on.) I shut down and it seemed normal until the mac mini restarted, saying there was a problem and the normal error report appeared on screen when everything rebooted(after I log back on.) I'm angry. Really what should I do, I just bought this on December 2011( i7 mac mini sandy bridge) of last year. I hope apple releases an update to fix this problem.
My first attempt was to go to disk utility and fixed it, it worked I was able to shut down. However after that it started to go back to the way it was and it still wont shut down. Yes Im able to do everything else like put the hardrive to sleep(yes it goes to sleep I made sure) and force closing applications. Right now Im going to attempt doing what I did before but I will appreciate if a representaive or an apple veteran would give me advice or some useful information on how to fix this problem.
This happened 8/18/2012 at 6:57(when I installed Mountain lion and checked.)

Open > http://www.reedcorner.net/understanding-upgrade-nightmares/

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Hi ppl again :)
I found that screen is not disabled, it is only have a very low brightness. So I begin to wait because I saw that actually installer is still running. Finally, Mas OS was installed and after that I change brightness using keyboard (it didn't worked while installation). Now all is ok. I also tried to reboot and system loaded correctly.
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My mac mini doesn't shut down after installing mountain lion?

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