ITunes Causing My Mac to Grind to a Halt

Hello,
I was looking for some help. A couple of weeks ago I did a wireless syce with my iPod Touch. I accidentlaly forgot about it and removed without properly ejecting. I notice the next day that with iTunes open on my Mac, everything was running extremely slow. For example a click ont he trackpad would take 30-40 seconds to register. Every ketystroke also took about the same. I called Apple and explained to them and over the phone we cleaned out iTunes. I thought everything was fine and now a few days later, I am noticing with iTumes open again. I am getting the same slow system response. As I soon as I close the application, everything running normally. Any suggestions? Do I need to re-install iTunes?
Thanks,
Eric

I just saw something happening in my Mac Mail that is very strange. Down on the bottom left corner in my mail app in activities box, I saw the app in the process of downloading hundreds of old spam and junk messages from my Gmail account. It has just started doing this just since I installed Mavericks. How can I stop this process? I went into Gmail and deleted everything I could, but it's still happening when I open my Mac Mail.

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Any help on this would definitely be appreciated. I am running iTunes and playing a group of songs. After some variable length of time (at least 30 min but it varies and can go for as long as a few hours), my Mac just powers down. When I restart it, everything seems fine - I verify and fix my drive using Disk Utility (normally catches one or two misassigned file ownerships) but the problem happens again if I am playing iTunes for an extended period of time. This is not a big deal but it is an irritant.
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Hi Dana:
I have not installed any iTunes plug-ins to the best of my knowledge. I checked my Energy Saver settings and they are at the same settings that I have had for years (the tick just below 15 min for both sliders). iTunes is v7.1 and QuickTime player is v7.1.5. I also had erroneously left the OS version from my last post - I am actually running 10.4.8. Hopefully this helps.
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You have not provided any information on which to base troubleshooting. Minimal information would include the Model Mac mini you have for example Mid 2010 Mac mini, exactly what happened when iTunes crashed, and what -- if anything -- happens when you try to restart. It is unlikely iTunes has anything to do with the failure to reboot but instead iTunes crashed because of what even caused your Man mini to fail.
Just as a starting point, be sure and check all your connections, power, monitor, keyboard, mouse, everything. You would not be the first to have a plug come adrift unexpectedly.

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I was conflicted about whether to put this question in the iTunes for Mac or the Mountain Lion community, but, as you can see, I've settled on Mountain Lion because I believe iTunes is not causing the problem.
I downloaded "Electric Ladyland" from iTunes the other day and received a digital booklet with the album. When I double-clicked the booklet in iTunes, Preview would open up (as it does with any of the other digital booklets I have stored in iTunes) and display the first or the second page of the PDF. After swiping either left or right to view the previous or the next page, though, Preview would completely shut down, necesitating a force quit every time.
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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Copy the PDF you're having problems with to the Public folder in your home folder.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up guest users” (without the quotes) in the search box. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. You'll need to navigate in the Finder to the Users folder, then to the home folder of your regular login account, and then to the Public folder, where you'll find the file you copied. Try to open it in Preview. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it. You can also delete the copy of the PDF.
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Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
*Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode.
Test while in safe mode. Same problem?
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http://support.apple.com/kb/TS3694
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