Why will my iMac not shutdown?

My iMac will not shutdown. It just goes to the grey screen and stops. I have upgraded my operating system to Mountain Lion with no improvement. Any suggestions?

Hmm, going by it's pretty poor reputation on here for mucking up Macs, Norton was probably a waste of money .
Doesn't explain the problem though if it was happening before you installed AV software.
When you attempt to shutdown, if you look in the Apple Menu>Force Quit does it show any applications not responding, or does it get past that and then just hang on a grey screen?
I'm struggling for ideas, hopefully someone else will spot this thread and have some clues/suggestions.

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Occasionally my imac will not shutdown. I have a 2011 Core i5 iMac. When I go to shut it down it will get to the screen with the spinning gear thingy and it will not shut down. After the screen goes to sleep it looks like the computer has shut down, but with the click of a mouse you find that it is still trying to shutdown. This doesn't happen every time I shutdown, but it happens enough to be annoying. Any ideas on how to fix my problem?

Then, I'd suggest you reinstall Lion on a freshly formatted drive then reinstall your third-party applications being careful that they are all known to be compatible with Lion. You may want to backup your files:
Install or Reinstall Lion from Scratch
If possible backup your files to an external drive or second internal drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Install button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

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We'd need to see them posted here to see if it was a problem, but if it isn't repeating in Console now as it's open, hen likely not a problem.
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for Shut Down problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
What happens?

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Ah yes school boy error there out of frustration and discontent..
My issue is with music/apps/films etc not downloading from iTunes / App Store.
They initially fail and message is displayed stating unable to download / purchase at this time, yet if I retry it says I've already purchased (?) or alternatively I go to the purchased section and there they are waiting with the cloud symbol..
However some items get frozen in the download window and cannot be retried or deleted. Message appears stating to tap to retry, but even if you stole every bath and sink in the uk you'd still not have enough taps.
I post here as the iTunes guys are useless in there 'help' and have only advised posting here or phoning apple, at my expense, to explain a problem that could be rectified by forwarding my original email to a techie. However the tech team apparently don't have an email address as they're from ye olde Middle Ages..!
Anyways I digress.
So I tried sync to pc, but instead of showing the file as ready to listen/use/view, the iCloud symbol shows and I'm back to square one as the item is unable to download..
At frustration station waiting for a train from pain...
All my software is up to date, and had all worked fine prior to the last big iOS update that resulted in all the changes in display and dismay.
Answers in a postcard :-)
Much love

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Test after each of the following steps that you haven’t already tried:
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 ▹ System Preferences ▹ Energy Saver ▹ Power Adapter ▹ Wake for network access: uncheck. You may need to unlock the preference pane by clicking the lock icon in the lower left corner and entering your administrator password.
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E.g. "An unexpected error occured" Anythng like that?
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Hi mountainnana,
Thank you for your response, sorry the guide was not what you were looking for.
Here are some other suggestions:
Open the HP Solution Center (icon is normally on the desktop.) Click on Set Preferences, Click on the Paper/Quality tab, for the Source choose Tray 2, choose the right paper size and media type. Click Apply, and then OK. Then try printing your photo again.
If that does not work there could be a driver/software conflict happening. If that is the case please try our HP Print and Scan Doctor.
Otherwise, proceed with a uninstall and reinstall of your printer software using the HP Printer Install Wizard for Windows.
Hope this solves your issue, and have a good day!
RnRMusicMan
I work on behalf of HP
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