New iMac hangs on shutdown

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Hello, maybe someone know what could be with my iMac 21.5-inch: 3.06GHz Intel Core i3,(OS X 10.6.6) Everything was working fine for about a couple weeks, but now it hangs at shut down. I left for a bit thinking it would eventually shut down, but came back an hour later to find it still spinning on the grey screen,I left during the night, but nothing has changed still spinning on the grey screen. The only way to shut it down was to hold the power button.
and another problem is when it is sleep mode, it automatically turns on for 10 seconds and switches off,and so several times a day.
Does anyone have any suggestions?
Thanks!
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Replay

I have this problem and tried everything here but it still does it. It's ok if I boot in safe mode but any user account (new or old) and it hangs when shutting down, My iMac is only a month old.
Jun 16 17:47:50 alan-imac shutdown[363]: halt by alan:
Jun 16 17:47:50 alan-imac shutdown[363]: SHUTDOWN_TIME: 1308242870 704004
Jun 16 17:47:55 alan-imac mDNSResponder[18]: mDNSResponder mDNSResponder-258.18 (Mar  5 2011 11:27:33) stopping
Jun 16 17:47:55 alan-imac imagent[180]: Quit - notifying about shutdown
Jun 16 17:47:55 alan-imac imagent[180]: Quit - shutting down daemon
Jun 16 17:47:55 alan-imac imagent[180]: [Warning] imagent shutting down
Jun 16 17:47:55 alan-imac PubSubAgent[322]: rlsCancel notifycancel(): (ipc/mig) server died
Jun 16 17:47:55 alan-imac DirectoryService[11]: BUG in libdispatch: 10J4138 - 1960 - 0x10004004
Jun 16 17:47:56 alan-imac imagent[180]: Unable to create APS daemon connection: (ipc/send) invalid destination port
Jun 16 17:47:55 alan-imac /usr/sbin/awacsd[30]: BUG in libdispatch: 10J4138 - 1960 - 0x10004004
Jun 16 17:47:56 alan-imac imagent[180]: Unable to set enabled topics: (ipc/send) invalid destination port
Jun 16 17:47:56 alan-imac awacsd[30]: SCDynamicStoreCreate[WithOptions] configopen(): (ipc/mig) server died
Jun 16 17:47:56: --- last message repeated 1 time ---
Jun 16 17:47:56 alan-imac awacsd[30]: Could not create session to Dynamic Store
Jun 16 17:47:56 alan-imac awacsd[30]: notify_register_check() failed, status=1000000
Jun 16 17:47:56 alan-imac awacsd[30]: SCDynamicStoreCreate[WithOptions] configopen(): Unknown service name
Jun 16 17:47:56 alan-imac awacsd[30]: Could not create session to Dynamic Store
Jun 16 17:47:56: --- last message repeated 2 times ---
Jun 16 17:47:56 alan-imac awacsd[30]: Exiting