IMac won't shut down or restart

My iMac 10.6.4 has been working fine until a couple of weeks ago. It will not shut down or restart unless I push the power button. The little wheel just keeps spinning on the blank screen. I'm not sure but I think shutting down with the power button may not be good for the machine. I do know that when I do start the machine it takes longer than usual. Watching the progress bar, it almost seems to be resetting. I have not installed any major apps prior to the problem beginning. I've run Disk Warrior, Drive Genius, and Tech Tool but none of them have found any problem. I've also have repaired permissions several times (although I have found one exception: "Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired." I'm not sure how important it is or if it's even needed. I don't know how it was modified). Sorry for the long explanation but I'm hoping someone can help. Much appreciated, thanks in advance.
Bob

Hi - you mention OS X 10.6.4 but your profile shows 10.6.5. If you did update to 10.6.5 using software update try downloading the combo installer: http://support.apple.com/kb/DL1324 and re-applying the update. It seems to fix all kinds of strange behaviour. Worth repairing permissions before and after the update.

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http://support.apple.com/kb/HT3964
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My ipad also does not shut down. I've tried to reboot a million times (holding down the home and power buttons simultaneously). I've tried resetting everything (after successfully backing up on iCloud). I tried the remote reboot (backing up ipad on iCloud, then on a separate computer, log on to iCloud, locate your device, clear all, reboot everything). Nothing worked. Took the ipad to the tech dept at the store, and they said its a mechanical failure of the power button, either the sensor or spring. Without the extended warranty, costs $250 to fix, because the screen is glued down to the machine. With the warranty, they would have replaced it for free. Ugh. My ipad is 1.5 years old. It would have been covered. But it shouldn't be so easy to damage! Outrageous that ipads are so glitchy at this price point. Outside techies can fix, but the machine could be damaged because of the way it's made.
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My Macbook Pro won't shut down or restart without forcing shut down. Hangs on grey screen. iTunes not recognizing iPod.

HELP!!!
Here are the specs of my machine:
2011 13.3" MacBook Pro
4 GB Ram/320 GB HD
For the past several months my MacBook Pro refuses to shut down or restart without holding down the power button. Whenever I choose to restart or shut down the computer, it will hang on a grey screen. I have even tried letting it hang for an hour, and it still won't shut down. I notice that once in a while it will retart or shut down correctly if I had not used opened iTunes since turning it on. However, even manually closing iTunes before shutting down or restarting does not solve the problem. It seems as though it only shuts down if iTunes was not used since restarting the computer. Is this a registry error? Do I need to reinstall iTunes? I noticed this problem began happening after I uninstalled Kaspersky Virus Scanner, could that be the problem as well? Also, I cannot guarantee that the problem is only associated with iTunes. I just noticed that one of the few times it shut down or restarted correctly, iTunes coincidentally had not been used. Also, this problem started happening while I was still using Lion and has continued despite upgrading to Mountain Lion.
Also, whenever I update my iPod through iTunes, it won't eject properly, and a transparent icon of the iPod displays on the screen even after I have removed it from the USB port. Furthermore, the iPod will only be recognized by iTunes and will only be updated the first time I plug it in. After removing it and plugging it back in, it won't recognize or update the device unless I shut down and restart the computer. I have the latest addition of iTunes. I also have two iPods, one 80 GB Classic, and one 8 GB Nano, and I have the same problem with both.
I have AppleCare. Should I take my macbook to the genius bar?
Applications I normally use are Word, Safari, FireFox, iTunes, FinalDraft, Photo Booth, Notes, Mail, App Store, etc. No real heavy lifting.
Any feedback would be very much appreciated. :-)
Thank you everyone!!

I have this question too.

IBook won't shut down or restart

Hello all!
I havent been able to shut down or restart my iBook! A friend of mine used my computer and I didnt know she stuck in one of those USB plug-ins (sorry, I dont know what its called) and pulled it out without ejecting properly and since then I see this disc logo marked "CDR" on my desktop that won't eject no matter how many times I drag it to trash and now just realized I can't shut down or restart my iBook. Help!!!
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Hi golfpunkgirl
Welcome to discussions
Which iBook is it - the White iBook has a Reset Button slightly to the right above the audio / videoport
Close all open apps then carefully using a paper clip gently press the button.
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OK, you may have deeper problems. First, go to System Preferences/Accounts, and make a 'Test" account, with full admin privileges. Switch to that account, by logging out of the manin account (Apple Menu), and see if you still have the same symptom. If you do, and Archive and Install might be the cure.
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Okay, just realized that the same problem occurs with the MBP after rejecting the external HD
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Force Quit .
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Thanks for the input Hatter. Can you tell me how to do the fsck -fy procedure or tell me where to find the directions?
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I am more in favor of reset nvram from inside Open
Firmware
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reset-nvram
set-defaults
reset-all
which I think does a better job dealing or clearing
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Now that you mention it, buying a new hub makes sense if your other suggestions don't work.
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Macbook Pro won't shut down or restart under Lion.

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Mine too. Restart and shutdown do longer works. Have to hard crash it each time.
Called Apple, they have no clue.
Buy a PC. At least Microsoft admit problems and offer solutions.

IMac won't shut down or restart

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