IMac 24 C2D freezing, beach ball, pinwheel

Hello wonderful user community!
I am helping my wife with this issue, she's never posted on the ASC before.
In the last two weeks my iMac has started behaving strangely.   It doesn't seem to matter whether running Spotify, Chrome, Firefox, or other applications, I will get beach balls, seemingly at random intervals.  If watching a video on Youtube or Netflix, the picture will freeze the but the audio will continue.  You can't Force Quit or make any commands in other applications, so it seems to be system wide.  If someone is playing a video from my hard drive from the LAN, their video playback will freeze.  After 15 secs to a minute or more, the machine will resume normal operation. 
What I've tried:
The OS was installed less than a year ago from 10.6 disk and updated to OS 10.6.8 using Combo Updater.
Disk Repair Permisions
Disk Repair (boot from external drive)
reset PRAM
Take to Genius Desk at Apple store (results inconclusive, no hardware issues)
Activity Monitor shows no app in particular hanging
I'm about to cut and run on this thing, put it on Craigslist, and move on. 
Any light shed on this would be incredibly helpful.  I work from this iMac while my daughter watches videos on a 2nd monitor throughout the day.  At night it's our TV and we watch movies on it.  Needless to say it's an integral part of our lifestyle. 
Hardware Overview:
  Model Name:          iMac
  Model Identifier:          iMac9,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.66 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          6 MB
  Memory:          8 GB
  Bus Speed:          1.07 GHz
  Boot ROM Version:          IM91.008D.B08
  SMC Version (system):          1.45f0
  Serial Number (system):          YD9*****0TG   <Serial Number Edited by Host>
  Hardware UUID:          93EC2F20-E293-50E4-9EC3-F0401B5D8D65
Console sample taken during time period of several hangs:
2/20/12 8:56:32 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 20:56:32 2012:405406] [info] [datastore.sync.syncset] [0xb0617000] [Start syncing /sc/5000]
2/20/12 8:56:47 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 20:56:47 2012:405079] [info] [datastore.volumerelayclient] [0xb0617000] [getBucketChangeId timed out. bucket id: 5000]
2/20/12 8:56:47 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 20:56:47 2012:405145] [error] [datastore.sync.syncset] [0xb0617000] [ScVolumeSyncer.cpp:1644 getBucketChid failed for path /sc/5000]
2/20/12 8:56:47 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 20:56:47 2012:405168] [info] [datastore.sync.manager] [0xb0617000] [restartWithDelay. syncPath = /sc/5000, delay = 600 sec]
2/20/12 9:01:54 PM
[0x0-0x25025].com.spotify.client[317]
05:01:54.340 I [social_presence.cpp:120] Presence: A track was played
2/20/12 9:01:55 PM
[0x0-0x25025].com.spotify.client[317]
05:01:55.352 I [snd:517] 64k-Latency: 2 ms. Play latency: 184 ms (ap)
2/20/12 9:06:47 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:06:47 2012:405283] [info] [datastore.sync.syncset] [0xb0617000] [Stop syncing /sc/5000]
2/20/12 9:06:47 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:06:47 2012:405353] [info] [datastore.sync.syncset] [0xb0617000] [Start syncing /sc/5000]
2/20/12 9:07:02 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:07:02 2012:404888] [info] [datastore.volumerelayclient] [0xb0617000] [getBucketChangeId timed out. bucket id: 5000]
2/20/12 9:07:02 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:07:02 2012:404974] [error] [datastore.sync.syncset] [0xb0617000] [ScVolumeSyncer.cpp:1644 getBucketChid failed for path /sc/5000]
2/20/12 9:07:02 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:07:02 2012:405016] [info] [datastore.sync.manager] [0xb0617000] [restartWithDelay. syncPath = /sc/5000, delay = 600 sec]
2/20/12 9:08:15 PM
[0x0-0x25025].com.spotify.client[317]
05:08:15.352 I [social_presence.cpp:120] Presence: A track was played
2/20/12 9:08:16 PM
[0x0-0x25025].com.spotify.client[317]
05:08:16.228 I [snd:517] 64k-Latency: 3 ms. Play latency: 195 ms (ap)
2/20/12 9:14:26 PM
[0x0-0x25025].com.spotify.client[317]
05:14:26.646 I [social_presence.cpp:120] Presence: A track was played
2/20/12 9:14:33 PM
[0x0-0x25025].com.spotify.client[317]
05:14:33.708 I [snd:517] 64k-Latency: 2 ms. Play latency: 6179 ms (ap)
2/20/12 9:15:36 PM
[0x0-0x25025].com.spotify.client[317]
05:15:36.315 I [offline-mgr:2144] Storage has been cleaned
2/20/12 9:17:02 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:17:02 2012:405144] [info] [datastore.sync.syncset] [0xb0617000] [Stop syncing /sc/5000]
2/20/12 9:17:02 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:17:02 2012:405274] [info] [datastore.sync.syncset] [0xb0617000] [Start syncing /sc/5000]
2/20/12 9:17:17 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:17:17 2012:405045] [info] [datastore.volumerelayclient] [0xb0617000] [getBucketChangeId timed out. bucket id: 5000]
2/20/12 9:17:17 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:17:17 2012:405155] [error] [datastore.sync.syncset] [0xb0617000] [ScVolumeSyncer.cpp:1644 getBucketChid failed for path /sc/5000]
2/20/12 9:17:17 PM
[0x0-0x13013].com.SugarSync.Manager[262]
[Mon Feb 20 21:17:17 2012:405181] [info] [datastore.sync.manager] [0xb0617000] [restartWithDelay. syncPath = /sc/5000, delay = 600 sec]

meow3cjc wrote:
I did study XLab's article before posting here, and I did check the Activity monitor for oddities and found none.
Another clue:  When watching a DVD disc, there are no freezes. This is the ONLY time we don't experience the 15 minute freeze cycle.  Starting to think the harddrive is failing...
If you suspect the HD is failing then run Apple Hardware Test in Extended Mode , it is wise to run the test 2-3 times to be sure. If it  picks up any error codes then you should plan on visiting an Apple Store or AASP to get it fixed and the codes interpreted. Apple does not publish what codes are interpreted as however some will give you a good idea. For example if it has HDD in it then you know the error is related to the HD however you don't know if it's the drive itself or it possible it could be  fan sensor for the HD, this is why it's smart to take it in.

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    If you're not logged in as an administrator, you won't be prompted for your password. The test will still run. It just won't do anything that requires administrator rights.
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    When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
    If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
    When you post the results, you might see the message, "You have included content in your post that is not permitted." That's because the forum software falsely identifies something in the post as a violation of the terms of use. If that happens, please post the results on Pastebin, then post a link here to the page you created.
    Note: This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
    Copyright © 2014 Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Terms of Use of Apple Support Communities ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

  • Imac runs slow  beach ball all the time, imac runs slow  beach ball all the time

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    OS X Lion: If your Mac runs slowly
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  • Import for about 10-15 min okay then import picture freezes beach ball

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    Message was edited by: Sasparilla256
    Message was edited by: Sasparilla256

    Found [this thread|http://discussions.apple.com/thread.jspa?messageID=6387869] ("iMovie freezes") that suggested one of the iMovie updates (likely 7.1.1) is the source of these import freezes. People have trashed their iMovie app and prefs, then did a re-install from the DVD and that fixed it for them. One guys claims he also updated to 7.1 and is still OK.
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  • IMac late 2009 - beach ball of death

    My iMac is hanging a ridiculous amount - Every 30 seconds or so, no matter how few applications are running, I get the beach ball of death. It'll typically stall for a minute or more. Ugh.
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    Yes... took it back to Mac Store who sent it to their depot who did a deeper scan and it was a failing harddrive.  Thank goodness for Time Machine and having backups... I am not as stressed as I would have been.  However, they reinstalled it with Snow Leopard instead of my purchased Mountain Lion.  When I brought it home I imported from Time Machine.  But another issue reared its head and fought with its password issues (seriously, hours of work there) only to find that I could not upgrade from SL to ML on my disc.  I did a check for software update from the Apple Icon (no Apple Store in SL) and it downloaded 1.6 GB of 5 updates (what appears to be the Java and others that are making the rounds currently).  When this installed I was unable to log in at all, unable to get past the login screen, with some heavy duty serious lag and blue screens.  So I am BACK at the Mac Store and having them do a complete wipe (again) and installation of Mountail Lion this time.  In theory I should be able to take my machine with a new harddrive, Mountain Lion installed, back home and import form Time Machine. 
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  • IPhoto hangs/freezes/beach balls when printing TIFF: solved

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    Terence Devlin wrote:
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  • IMac full of beach balls

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    Some procedural tests to help narrow down the cause...
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  • IMac randomly freezes. Spinning pinwheel

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    You people are overly cautious. As long as the drive isn't being written to at the time, you're not likely to do any harm to the system shutting it down by holding in the power button. Things were a bit different in the days before journaled filesystems, but like so many bits of sage IT wisdom floating about, it's based on severely outdated information. Look at the number of people still giving advice for ni-cad batteries to people with Li-Ion batteries for example. Telling them all about memory effects, and how you should let the battery completely discharge before charging it again. Hasn't been valid advice for probably 10+ years, which is probably just about how long it takes for it to filter down to the general populace. You've got to just love it when someone tries to pass off someone else's bit of advice/wisdom as their own in an attempt to seem like some kind of IT sage, and then because they don't really understand any of the background info, invariably screw it up or keep repeating the same bit of advice for years, long after it stopped being relevant.
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  • IMac Super Slow - Beach Ball of Death always spinning

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    How much free space do,you have left on your startup drive?
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  • FREEZE (Beach Ball) in ALL ANY VIDEO PLAYER

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    <Edited by Host>

    How much hard drive space do you have? How much ram do you have?
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    Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751
    Message was edited by: CMCSK

  • Spinning beach ball on yosemite

    iMac gets spinning beach ball every so often. I must wait for about 5 minutes to get back control. HD only half full. Plenty of RAM. Activity monitor doesn't show high usage of CPU or RAM when beach ball spins. Please help.

    HD only half full. Plenty of RAM.
    How large is your HD and how much space do you have left?
    How much RAM do you have?
    Which model iMac are you using?
    Check out:  Troubleshoot the spinning beach ball/freezing & crashing
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