I can't shutdown my iMac OS X 10.6

I have that problem for a long time grrrrr, guys from Apple Support can't help me. What to do??? Shoud I back to Leopard???

When upgrading, did you follow the normal procedure to upgrade?*
http://www.macmaps.com/upgradefaq.html
If not, which steps have you missed?
How much free hard disk space do you have?
How big is the hard drive?
Was data backed up?
How much RAM does your machine have?
Have you checked the compatibility listing of all your installed software and drivers with the links provided in the above link?
Why can't Apple support help you?
Is your machine out of the one year warranty, and you didn't purchase AppleCare?
Going back to Leopard is difficult without a backup. But without knowing whats on your machine, or the status of your backup, we can't say for certain if going back is advisable.
- * Links to my pages may give me compensation.

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http://www.maclife.com/article/columns/maclife_101_how_create_adhoc_network

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When posting in Apple Communties/Forums/Message Boards.......It would help us to know which Mac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
CLICKY CLICK-----> Help us to help you on these forums
***This will help in providing you with the proper and/or correct solutions.***

I can't shutdown my iMac OS X 10.6

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