My iMac freezes when it restarts

I have tried the disk utility, not really sure what I am supposed to do with it. I have rebooted several time, holding the Option Key and choosing my start up disk. I actually got it to restart once, but then I turned my computer off again (because after I ran a maintance program, it told me to)...then I had the same problem.
Here is what happens when I turn my iMac Intel on:
It goes to the Apple logo, then the blue screen...but a loading sign goes on...and stays on...and thats it.
Any clues on whats going on, what caused this and or how to fix it?

I have tried the disk utility, not really sure what I am supposed to do with it.Repair Permissions: This should be done BEFORE and AFTER all software installs and updates.
1. Navigate to Utilities/DiskUtility and launch Disk Utility.
2. Choose your volume (usually the second icon)
3. Choose "First Aid" tab
4. Click on "Repair Permissions"
Also run "verify" disk. If the disk needs repair:
Repair Disk:
Steps for using Disk Utility
1. Insert your Mac OS X CD-ROM disc or Restore DVD disc, then restart the computer while holding the C key until you see the spinning gear..
2. Once started up from CD or DVD, choose Disk Utility from the Installer menu.
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from disc to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume, if necessary.
6. Click Repair.
If you repair errors run it until no errors found.
Also try booting in "safe mode" if you can. Restart and hold the "shift" key as soon as you hear the startup chime.
-mj
[email protected]

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TutorDaddy, if this Mac is still covered by the initial warranty or under AppleCare, take it in and have it looked at. As the old label used to say, there truly are "no user serviceable parts inside." Kernel panics very usually indicate failing hardware.
I have an older iBook G4 that started developing kernel panics and like you, despite reinstalling the OS from a freshly formatted volume, they kept continuing. I looked at the crash log and saw that in each instance of panic, the last bit of code to be accessed had something to do with AirPort. Knowing that the AirPort software was at then current levels, I surmised the problem to be a bad AirPort networking card which, on that particular model of the iBook, was a very small module attached directly to the logic board. Since the computer was out of AppleCare, I broke the machine down myself (I didn't realize that there could be so many barely visible screws in one machine) and removed the offending piece of hardware. My iBook lives but without WiFi, it now sits as a more or less desktop machine needing an ethernet connection to stay connected to a network.
I do not suggest you break into your iMac. First of all, I'm guessing one would need to be able to pull off the glass and have the necessary glue to reattach it, which is not really available to us consumers. If you're feeling adventurous enough to read the crash logs from each panic, you might be able to surmise the hardware component (or badly written application or library; it can happen) that's causing the panic. If it's a software issue, remove the offending software app and see if the panics return. If it's a hardware issue, it's best to let a competent service tech qualified on Apple hardware to handle it.
[edited to add:]
After browsing through related problems in the discussions, I saw this link to a third-party web site being handed out. Perhaps you'll find it useful: http://www.thexlab.com/faqs/kernelpanics.html
Message was edited by: Stephen Adams

IMac freezes when changing the screen saver

Hi all:
I originally posted this in the "Using Mac OS X" forum (iMac freezes when changing the screen saver, but thought I'd post here as well since the issue arises on a freshly installed OS.
We've got three 350MHz slot-loading G3 iMacs (with 512MB RAM) which we're planning to use for basic word processing. The install of Panther (10.3.5 from black retail cds with 10-seat volume license) went fine on the first two. Ran the updates to 10.3.9, installed MS Office 2004, everything working great (they're a little slow, but after all, they are only 350 MHz).
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I'm going to mark this one as answered.
I removed the hard drive from the iMac, and put it into another 350 MHz iMac, and everything works great. I can select any screen saver without having it freeze, create new accounts, whatever my little heart desires.
In checking the history of the problem iMac, there was an assortment of problems with booting (both from the hard drive and from the CD-ROM drive) which were never satisfactorily resolved. The problems just seemed to go away after sitting unplugged for a few days, as much as for anything we actually did to it.
Now we just have to decide whether it's worth fixing, or using it somewhere in a non-critical role with OS 9 installed.
Cheers,
Andrew

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Hi,
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http://support.apple.com/kb/PH7029
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Many thanks in advance for help.
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6/15/08 5:00:00 PM [0x0-0xe00e].com.toastycode.CuckooChimeAgent[121] CuckooChimeAgent(121,0xa0259fa0) malloc: * error for object 0x1536b0: double free
6/15/08 5:00:00 PM [0x0-0xe00e].com.toastycode.CuckooChimeAgent[121] * set a breakpoint in mallocerrorbreak to debug
6/15/08 7:29:19 PM desktopia[122] firing 00-00.jpg in 34240.018068 seconds
6/15/08 7:29:19 PM desktopia[122] firing 04-00.jpg in 37840.008991 seconds
6/15/08 7:29:19 PM desktopia[122] firing 07-00.jpg in 40540.005288 seconds
6/15/08 7:29:19 PM desktopia[122] firing 09-00.jpg in 45040.003027 seconds
6/15/08 7:29:19 PM desktopia[122] firing 12-00.jpg in 48640.000343 seconds
6/15/08 7:29:20 PM desktopia[122] firing 16-00.jpg in 77439.998329 seconds
6/15/08 7:29:20 PM desktopia[122] firing 20-00.jpg in 81039.996202 seconds
6/15/08 7:29:20 PM desktopia[122] firing 22-00.jpg in 84639.861420 seconds
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6/15/08 8:07:52 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
6/15/08 8:07:52 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
6/15/08 8:08:10 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[80]) Exited: Terminated
6/15/08 8:08:10 PM com.apple.launchctl.Aqua[88] launchctl: Please convert the following to launchd: /etc/machinit_peruser.d/RemoteUI.plist
6/15/08 8:08:11 PM Dock[96] _DESCRegisterDockExtraClient failed 268435459
6/15/08 8:08:13 PM desktopia[127] firing 00-00.jpg in 31906.433221 seconds
6/15/08 8:08:13 PM desktopia[127] firing 04-00.jpg in 35506.415797 seconds
6/15/08 8:08:13 PM desktopia[127] firing 07-00.jpg in 38206.414950 seconds
6/15/08 8:08:13 PM desktopia[127] firing 09-00.jpg in 42706.414463 seconds
6/15/08 8:08:13 PM desktopia[127] firing 12-00.jpg in 46306.413962 seconds
6/15/08 8:08:13 PM desktopia[127] firing 16-00.jpg in 75106.413458 seconds
6/15/08 8:08:13 PM desktopia[127] firing 20-00.jpg in 78706.412970 seconds
6/15/08 8:08:13 PM desktopia[127] firing 22-00.jpg in 82306.398947 seconds
6/15/08 8:39:14 PM com.apple.loginwindow[23] Shutdown NOW!
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6/16/08 12:47:44 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
6/16/08 12:47:45 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
6/16/08 12:47:45 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
6/16/08 12:48:07 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[86]) Exited: Terminated
6/16/08 12:48:07 PM com.apple.launchctl.Aqua[91] launchctl: Please convert the following to launchd: /etc/machinit_peruser.d/RemoteUI.plist
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6/16/08 12:48:10 PM desktopia[133] firing 04-00.jpg in 61909.772471 seconds
6/16/08 12:48:10 PM desktopia[133] firing 07-00.jpg in 64609.771625 seconds
6/16/08 12:48:10 PM desktopia[133] firing 09-00.jpg in 69109.771061 seconds
6/16/08 12:48:10 PM desktopia[133] firing 12-00.jpg in 72709.765591 seconds
6/16/08 12:48:10 PM desktopia[133] firing 16-00.jpg in 15109.765010 seconds
6/16/08 12:48:10 PM desktopia[133] firing 20-00.jpg in 18709.764175 seconds
6/16/08 12:48:10 PM desktopia[133] firing 22-00.jpg in 22309.763583 seconds
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6/16/08 12:48:53 PM SoftwareUpdateCheck[127] Downloading "QuickTime"
6/16/08 12:52:11 PM SoftwareUpdateCheck[127] Auto-download of "QuickTime" SUCCESSFUL.
6/16/08 12:52:11 PM SoftwareUpdateCheck[127] Downloading "AirPort Utility"
6/16/08 12:52:48 PM SoftwareUpdateCheck[127] Auto-download of "AirPort Utility" SUCCESSFUL.
6/16/08 12:52:48 PM SoftwareUpdateCheck[127] Downloading "Digital Camera Raw Compatibility Update"
6/16/08 12:52:58 PM SoftwareUpdateCheck[127] Auto-download of "Digital Camera Raw Compatibility Update" SUCCESSFUL.
6/16/08 12:52:58 PM Software Update[160] arguments=(null)
6/16/08 12:53:43 PM com.apple.launchd[73] ([0x0-0xd00d].SoftwareUpdateCheck[127]) Exited with exit code: 102
6/16/08 1:58:19 PM desktopia[133] firing 00-00.jpg in 54100.019894 seconds
6/16/08 1:58:19 PM desktopia[133] firing 04-00.jpg in 57700.016479 seconds
6/16/08 1:58:19 PM desktopia[133] firing 07-00.jpg in 60400.011896 seconds
6/16/08 1:58:19 PM desktopia[133] firing 09-00.jpg in 64900.009819 seconds
6/16/08 1:58:19 PM desktopia[133] firing 12-00.jpg in 68500.007770 seconds
6/16/08 1:58:19 PM desktopia[133] firing 16-00.jpg in 10900.005813 seconds
6/16/08 1:58:19 PM desktopia[133] firing 20-00.jpg in 14500.003580 seconds
6/16/08 1:58:20 PM desktopia[133] firing 22-00.jpg in 18099.765326 seconds
6/16/08 2:30:17 PM com.apple.launchctl.System[2] fsck_hfs: Volume is journaled. No checking performed.
6/16/08 2:30:17 PM com.apple.launchctl.System[2] fsck_hfs: Use the -f option to force checking.
6/16/08 2:30:19 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
6/16/08 2:30:19 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
6/16/08 2:30:19 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
6/16/08 2:30:37 PM org.ntp.ntpd[14] Error : nodename nor servname provided, or not known
6/16/08 2:32:59 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
6/16/08 2:32:59 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
6/16/08 2:32:59 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
6/16/08 2:33:20 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[81]) Exited: Terminated
6/16/08 2:33:20 PM com.apple.launchctl.Aqua[89] launchctl: Please convert the following to launchd: /etc/machinit_peruser.d/RemoteUI.plist
6/16/08 2:33:31 PM desktopia[133] firing 00-00.jpg in 51988.027814 seconds
6/16/08 2:33:31 PM desktopia[133] firing 04-00.jpg in 55588.026847 seconds
6/16/08 2:33:31 PM desktopia[133] firing 07-00.jpg in 58288.024541 seconds
6/16/08 2:33:31 PM desktopia[133] firing 09-00.jpg in 62788.024045 seconds
6/16/08 2:33:31 PM desktopia[133] firing 12-00.jpg in 66388.023558 seconds
6/16/08 2:33:31 PM desktopia[133] firing 16-00.jpg in 8788.023087 seconds
6/16/08 2:33:31 PM desktopia[133] firing 20-00.jpg in 12388.022606 seconds
6/16/08 2:33:31 PM desktopia[133] firing 22-00.jpg in 15988.022127 seconds
6/16/08 2:50:23 PM Software Update[186] arguments=(null)

My iMac freezes when i try to use iTunes...

Greetings,
When i try to play tv episodes or movies that i've purchased from iTunes, my iMac completely freezes and I must restart using the start button on the back.
Please help! Thanks in advance!

I had the same issue. My itunes plists had become corrupted.
I had to call Support who told me to do the following.
move 3 x itunes.plist onto desktop
move itunes music folder onto desktop
trash itunes
reboot imac
check itunes is gone
download itunes
install itunes
open itunes and cancel tfr of exisiting itunes music
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When I connect my shuffle to my IMAC to download songs or recharge, it doesn't sync and, in fact, freezes my IMAC. I have to shut the computer down to make it right. Unable to download any tunes to IPOD. Help please...!

alright one thing you should do is be patient. Give the shuffle at least 10min while its connected. With the new version of itunes out people have had this happen. If this does not work try re-downloading the latest version of itunes. Also restart your ipod. Give it a shot. hope all goes well.

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Had had my 500GB HD replaced by apple in my imac24 today, after reinstalling everything and updating I indeed am experiencing the issue of the power button press to sleep COMPLETY locking and freezing the iMac.
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Imac freeze when I update to 10.6.8

HI,
It seems that prior updates worked. However, when I update to 10.6.8 my system will freeze. The only that that moves is my cursor.
I can be on the web, scrolling. It will happem when new email is being down loaded. I can be working on th PC side and will experence it.
I ran the "Disk" repair. But even after the run is done the system will work for a short while and the freeze.
Now I can reinstall 10.5 "Snow Lepoard" and not update to the latest "Package" update and all works well.
So the main question is "What gives?". Its very troublesome. Is there any soulition to this?

How much RAM is installed? How much free space on your hard drive?
How to Install Snow Leopard Successfully
A. Repair the Hard Drive and Permissions:
Boot from your current OS X Installer disc. After the installer loads select your language and click on the Continue button. Then select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger) and/or TechTool Pro (4.5.2 for Tiger) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
B. Make a Bootable Backup Using Restore Option of Disk Utility:
Open Disk Utility from the Utilities folder.
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.
C. Important: Please read before installing:
If you have a FireWire hard drive connected, disconnect it before installing the update unless you will boot from this drive and install the update on it. Reconnect it and turn it back on after installation is complete and you've restarted.
You may experience unexpected results if you have installed third-party system software modifications, or if you have modified the operating system through other means. (This does not apply to normal application software installation.)
The installation process should not be interrupted. If a power outage or other interruption occurs during installation, use the standalone installer (see below) from Apple Downloads to update. While the installation is in progress do not use the computer.
D. To upgrade:
Purchase the Snow Leopard Retail DVD.
Boot From The OS X Installer Disc:
Insert OS X Installer Disc into the optical drive.
Restart the computer.
Immediately after the chime press and hold down the "C" key.
Release the key when the spinning gear below the dark gray Apple logo appears.
Wait for installer to finish loading.
E. If updating:
Download and install update(s)
Use Software Update, or
Download standalone updater(s).

Imac freezes when listening to NPR for halfway through Youtube videos, etc

Hello,
I am having a problem with my iMac, and other post didn't seem to touch on this exact subject:
Everytime I am listening to NPR radio (online newscast stream), the stream will freeze repeatedly, thus essentially disabling me to listen. Also, this will occasionally happen when watching video on Youtube, Vimeo, etc. My iMac doesn't itself freeze, just the newscast/video. Is this a problem with my computer?
I installed an extra 4GB of RAM, thinking this would help, but to no avail. In fact, it seems worse. Anyone know what might be causing this?
Thanks in advance,
_ j

It's probably nothing to do with your iMac but the stream coming from the provider. Where I'd begin looking is your w-fi settings. For example if you live in an area with lot's of wi-fi networks you could be competing for bandwidth with your neighbors. This can be easily solved by changing the wi-fi channel. Most wi-fi networks use channels 5 or 6 as their default channels and most users are too lazy to change the channel although there are 11 to choose from. My recommendation is to download and install iStumbler and see which channels are being used.Then it's a simple matter of changing your channel. If you're using an Apple router (Airport Express, Airport Extreme or Time Capsule) then simply launch Airport Utility and make the change. If you're using a third party router then look in the manual to see how to change channels.
Roger

My iMac freezes when it restarts

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