Imac will not complete reboot

imac will come on but not complete reboot process (gray Apple and spinning wheel. can anyone help?

Hello,
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
Any clues?

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Cut the power to my iMac and now it will not complete rebooting when trying to restart

Please can anybody help me?

When this happens to me, I like to work from the outside in. Booting in safe mode can fix issues with with certain things not loading during boot. Resetting the SMC can fix issues like the wrong boot volume specified or a non-standard startup drive.
I like to start with booting from a USB or in your case the install DVD (I see 10.6.7 if your sig). From the install menu you can use disk utility to check out your boot volume and repair it.
If you can describe what you see when you reboot it would help people understand how far you are getting. Also, do you boot to a login screen or straight to the desktop? Did the power go out while booting or while working?

After upgrades iMac will not completely restart.. lost please help

Hi, I am new to the forum but I have been scouring the net for an answer to my problem. I have found some similar problems but nothing exact so I decided to post to make a deadline. Please help.
Yesterday night I got one of those apple software updates. I cant remember what it was for but it was fot 3 different things nothing out of the ordinary. Once they were installed I had to restart my computer. I did this and when I did my computer booted up and froze at the blue screen after the white/grey apple screen and will go no further.
Heres where it gets a little different from other posts I have found. I have a wireless keyboard and mouse so I cannot run the start up disks or get to safe mode. I bought a different usb mouse and keyboard today and am now able to put disks in and out of the disk drive by holding down the left button during start up. The only problem the keyboard came with software that needs to be installed to make it work. So it is still impossible to connect to a keyboard. So I still cant hold shift, control or c to get to safe mode or run my mac disks.
Im not sure where to go from hear. I have a seagate external harddrive backing everything up so hopefully I didnt lose everything. Any help would be great I am lost.
Thanks for your time

When you get the new keyboard, start up from Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again 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.
6. Click Repair. Disk Utility checks and repairs the disk.
Reboot, then repair permissions from your hard drive.

Firefox will not complete the installation even after several attempts of rebooting the computer.

I downloaded the Firefox 9.0.1 upgrade but it will not complete the installation on my computer. Everytime I try to remove the program, it tells me to reboot the computer to finish the installation. After several reboots, the same error keeps coming up.

Try to run the Firefox program once as Administrator (right-click firefox.exe: Run as Administrator).
If that doesn't solve the problem then remove the Firefox program folder (C:\Program Files\Mozilla Firefox\) to do a clean reinstall.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 9.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible.
*Do NOT remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Mac mini will not complete shutdown-closes desktop, goes to blue screen, and spinning icon just spins forever, so must power off to reboot.

Recently, My Mac-mini will not complete the "shutdown" or "restart" routine; it closes the desktop screen, goes to the light blue screen, but then the spinning indicator (not the "wheel of death") just keeps spinning forever with no shutdown (I've let it spin for >2 hrs.). Have run disk/permissions verifications and repairs from applejack, disk utility, Mactuneup.app & all report ok. Any suggestions, please?
Doug

Have you tried with
Control Option-Command-Eject

My iMac will not boot through Snow Leopard but will boot through Windows OS

My 2010 iMac will not boot in Snow Leopard, only Windows. Have tried reinstalling Snow leopard a few times and works only for a couple of minutes before freezing and doesnt reboot. Windows works perfect. Snow leopard just doesnt want to boot up past the Apple Logo. It was working fine one day and the next day it froze up and was able to reboot back into Snow Leopard but kept freezing. Now it doesnt load at all into Mac OS.
Brian

Possible scenarios:
1: The 10.6.3 SL retail disk is bad, it happens.
2: Your not using the 10.6.3 SL retail disk but one from another machine which doesn't have the drivers for that machine.
3: Your optical drive is funky or some other hardware issues.
4: Your trying to install 10.6 onto a PowerPC based Mac, no can do.
5: Your not using a wired keyboard for boot key commands, have some other hardware conflicts.
Possible solutions.
1: Copy the SL 10.6.3 disk using Disk Utility to another DVD, the error checking may resolve the original disk's issue.
http://www.brokenhomeboy.co.uk/pierow/blog/2011/10/make-a-bootable-backup-snow-l eopard-install-disc/
2: Make a SL bootable USB
http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
3: Call Apple for a new 10.6.3 disk (and make copies for backup before Apple discontinues selling it)
If your upgrading to 10.6 to get to 10.6.8 to upgrade to 10.7, be warned of this:
1: Your 10.5 software will not work in 10.7, no more Rosetta or PPC based code.
2: Your hardware will not qualify if it's a 32 bit Intel Core Duo, also you may experience slowdowns in performance over 10.6 (10.6 is the fastest OS X version for Intel Macs) in older Intel hardware (I suggest Early 2011 Mac's and later only for Lion)
3: Mountain Lion 10.8 is reportingly coming out this summer and will not run on a lot of older Intel based Mac's because of heftier graphics requirements.
4: 10.6 has the widest range of current avaialble software and drivers for third party hardware.
My advice, stick with 10.6.8 and stay there, buy a new Mountain Lion machine after this summer. Skip Lion completely.

File exports stuck at 95% will not complete exporting process in Final Cut X or Compressor. Is there a fix?

In Final Cut X and Compressor 4 when outputting files the processing stops at 95%, and will not complete the job. This happens with all of various export options except export media to a QuickTime file. Anyone have an idea what could be causing this problem?
I have the most current iMac running the latest version of Lion.

I have tried everything, including starting threads here on the Apple Discussion Boards and on Creative Cow, etc. The 95% STALL is a bug. What I have done is to create a hard drive with LION on it, then, when I want to use Compressor I reboot from that hard drive in Lion and then Compressor works fine. It is a Mountain Lion issue, that is when it all started for me.
I thought the new update to Compressor, 4.0.5, would solve this and was really bummed when it didn't.
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IOS 8.1.1 will not complete install on iPad 2....

Doing via USB connection to iMac it goes through all the verification and installation processes but will not complete and keeps returning to message stating update 8.1.1 is available and do I want to intsall it. It has repeated itself 4 times now.
iMac is on 10.10.1 and iTunes latest version.
Any help appreciated.

Thanks for the help, Demo
I did all that you said except rebooting the Mac (I wanted to first discover where the issue was happening) and that solved it.
On USB reconnecting the iPad to the Mac, iTunes launched and reported that it was running iOS 8.1.1. Therefore all that was needed was to reboot the iPad after the installation process. However, Apple's installation process did not instruct that and so I feel it is at fault - It should message the updated status of the iOS rather than leave the user in a loop as it did with me.

Intel iMac will not boot past gray screen

Intel iMac will not boot past gray screen
my system:
new (month old) 24" intel imac, 2.8 ghz, 4 gb ram.
running: leopard (upgraded from tiger, which was pre-installed at purchase), installed 10.5.1 update right before this huge problem occurred.
install discs on-hand: two-disc tiget set, single leopard upgrade disc.
what led to this:
i wanted to install windows using bootcamp on a 50 gb partition.
at this point i was running leopard 10.5
i followed all bootcamp instructions, printing out the guide, as well. once i got into the windows setup, i was prompted to choose a partition to install windows. unlike the bootcamp guide, which showed three partitions, one clearly labeled "bootcamp", i saw only one partition. not wanting to risk writing over my mac partition, i quit the setup and rebooted the mac os. after some googling around, i looked for firmware updates (didn't need any), and then software updates. i decided to try updating to 10.5.1.
i then ran through boot camp again, deleting my previous windows partition, creating a new one, and moving forward as before. once again, i was only shown one partition to choose from in the windows setup. i exited the setup again to reboot through the mac os, but this time, i was only given a blank gray screen.
here's what i have tried so far:
booting from a CD, holding down the C or D keys: no response (in fact, i have to restart the computer holding down the mouse button to be able to eject the CD)
booting with option key held down: gray screen
booting with option key held down with external bootable firewire drive attached: the firewire drive appears as a boot icon, and i can click on it within a five second window, but then the screen freezes after that time period, and nothing changes
booting into target mode while attached to another mac: gray screen (no firewire icon, and drive never shows up on other mac)
resetting NVRAM: i'm able to hear the boot chimes, but no difference in performance. gray screen every time
Safe boot: nothing but a gray screen
Verbose mode: gray screen
Single user mode: gray screen
Single user mode with firewire drive attached: occasionally (not every time), i am able to get the white on black terminal to show up. from here, i'm able to run fsck, but it appears to only be checking the firewire drive. i have tried several times to boot from here, and once it took me to a blue screen with movable arrow cursor, but it never went beyond this.
is there anything else left to try before taking it to apple?
any help would be greatly appreciated.
thanks,
Casey Burns
Casey Burns Illustration and Design
http://CaseyBurns.com

I'd call Apple support at this point. You'll need
to put this issue on the record.
Call U.S. iPod and Mac technical support: 1-800-APL-CARE (1-800-275-2273)
The wait may be long for an agent to come on the line
so expect that and have some other stuff to do in the meantime.
If you have the applecare protection plan, I'd ask about "onsite"
service.
I like your work ! Good luck !
Slim
Message was edited by: slimpikkunz

HT3669 My Epson Perfection 1200 scanner functions as a flatbed scanner but when I try to scan transparencies the control panels change in Image Capture but the scanner bar will not complete the overview scan & cannot travel beyond the first 2/3 centimet

Epson Perfection 1200 scanner continues to function as a flatbed scanner but when I try to scan transparencies/film negs the control panels change in Image Capture but the scanner bar will not complete the overview scan & cannot travel beyond the first 2/3 centimeters. All the communications seem to recognise the scanner and the mode for the intended scan but the necessary overview scan is not completed, nothing comes up on the Image Capture scan window. If I unplug the film adaptor I can get a document scan. When I plug in the adaptor again the Image Capture details change which allows me to select the type of scan required but when the scanner attempts an overview scan it is unable to complete it.
I have had the scanner from new (12 Years) and have previously scanned slides and film with the adaptor but maybe this was before I upgraded my computer (imac 27").
Do I have to buy a new scanner? It seems so close to working correctly.
I have downloaded the Epson recommended driver (5.4) and have Epson Perfection 1200 6.6 Universal showing in the Applications List.
Any thoughts or observations would be much appreciated before I go out and spend money an new hardware.
Thanks

I have same issue - have you solved this yet?

An app will not completely download from the App Store to my iPhone 5S. Neither can I terminate the download by trying to delete it. The app is useless to me and so I would like to remove the icon from my home screen. How can I do this?

I tried to download the app "Google Translate" from the App Store onto my iPhone 5s. However, the download will not complete. As well, when I try to delete the icon from my home screen, it will not go away. I am very frustrated as this has never happened before and I have gotten many paid and free apps from the App Store. I hope someone can solve my dilemma. Thank you kindly.

What have you tried to get the app to finish downloading e.g. have you tried logging out and back into your account on your phone, disconnecting and reconnecting to your network, soft-reset of your phone (press and hold both the sleep and home buttons for about 10 to 15 seconds, ignore the red slider, after which the Apple logo should appear and it should reboot) ?
You could also try downloading the update on your computer's iTunes and see if you can sync it over to your phone (or delete the app its Apps tab when connected to your computer's iTunes and sync the new version - deleting the app will delete its contents).

IMac will not boot, hard drive file problem? Can't install OS in 2nd part.

The iMac will not boot. The Apple displays on the screen, the cursor spins for awhile, and then it loops into a reboot effort.
Last night, I was doing a lot of custom file sharing settings using the include enclosed folders option at the bottom of the Get Info window.
Question 1: Could that file sharing process have messed things up?
In an effort to get things going........ A few weeks back, I used Disk Utility to create a 2nd partition, with the intent of installing Ubuntu Linux there. I never attempted the install, as far as I can remember, while playing with the Ubuntu Live CD. So, I thought I would install 10.5.6 from the CD in the 2nd partition. But I get an error message that says "The installer could not create the folder "/Volumes/Ubuntu 9.10/BaseSystem.pkg.161nDNDdQ.""
Question 2: I also shared that partition, could that have caused the OS install failure?
Question 3: If I understand the book correctly, I can try to install the OS from the CD on the 1st partition, and not lose my data, correct? Unfortunately, I don't have any backup for the data, as I don't own any drives large enough yet to accommodate the data on the drive.
Question 4: Anyone have any other thoughts as to what ent wrong?

Hi, Grant.
Sometimes, it just pays to think on a problem. I awoke thinking, if it will boot the OS X install CD, it ought to boot my Ubuntu Live CD. And then, maybe I can change permissions on the first partition. As soon as I thought that, it occurred to me, if the problems are with the permissions, what if I used the OS X disk, and erased (formatted) the Ubuntu partition. That should set all the permissions on that partition back to default. Would OS X install then to the Ubuntu partition?
You better believe it did!! I'm typing this from the Mac after updating my 10.5.6 to 10.5.8 in the 2nd partition, and I'm booting from the 2nd partition.
I then did as you suggested, and from the Mac, I repaired the permissions to the first partition. But, the result was the same, there are a few permissions that do not match, and Disk Utility cannot, does not, or will not correct them.
I'm currently downloading the 10.5.8 combo update .dmg file. My thought is to burn that to a disk, and then install it over the version in partition 1. And trust that the current installation on partition 1 does not have any cross linked files that will destroy some data.
I do have some old ATA IDE drives I can hook externally to the Mac, and copy some of the information I have from the Mac to those drives before doing the 10.5.8 install.
Can you think of a better solution?

TS1587 I tried everything, except for reinstalling the SO-DIMM memory modules. Still, my iMac will not wake up. Turning it on you can hear the fan run, but the display stays dark. Any ideas what to do? Thanks Maja

My iMac won't start up, or wake from sleep. I've tried everything, except for reinstalling the SO-DIMM memory modules. Still, my iMac will not wake up. Turning it on, you can hear the fan run, but the display stays dark. Any ideas what to do? Thanks!

Mac doesn't boot
Can you hear the fans and hard drive and see the white boot screen? Flashing question mark? The circle just runs and nothing happens? Only black screen and nothing else? These can be very helpful to diagnose the source of the problem. [1]
Flashing question mark [2]: This is usually a sign of a failed hard drive. This indicates that boot up volume can not be found.
Black screen: This is usually a sign of a failed logic board. There is no single reason for this and this may be caused by failed GPU, screen, CPU or RAM.
Circle of death/no circle/blue screen: This is usually a sign of a hard drive failure. This may NOT be a dead hard drive, just broken permissions or something
Gray screen/Apple logo/spinning gear or globe/prohibitory sign/folder with flashing question mark [3]: This could be a sign of faulty hardware but more likely a software issue, i.e. broken permissions, failed software update, etc.
[edit]
What to do
First, hold down the option key (also known as the alt key) just after you've pressed the power button. This should show all the available options to boot from, so if you have Windows installed through Bootcamp or a disk in your SuperDrive, you should be able to see them along with your OS X drive/partition. Select the OS X partition with arrow keys and press enter. Startup key combinations
If that doesn't help continue doing the steps from below:
1. SMC reset [4]. Shut down and unplug all cables including power cord for at least 30 seconds and then plug in power cord and keyboard/mouse.
2. PRAM reset [5]. Hold down option, command, P and R while booting. Start it when you hear the sound and don't let go before it reboots.
3. Safe boot [6]. Hold down shift while booting to boot into safe mode. If this works, open Disk Utility from Utilities and repair your permissions and verify the disk
4. Hardware test [7]. Insert the install disk (disk 1 in Mac which shipped with OS X 10.5.4 or earlier, disk 2 if shipped with OS X 10.5.5 or newer) and hold down "D" before the grey boot screen opens. Follow on screen instructions
5. Boot from install disk. Boot from the disk that came with your Mac. Hold C while booting. Select Disk Utility from top bar and repair permissions and verify the disk. Reboot normally and see if it works now.
6. Boot from another Mac (Firewire target disk mode). Connect the machines with a Firewire cable. Power on your Mac and press T. Select the other Mac's hard drive. Download the current OS X combo update. Run the combo update installer and select the drive that won't boot as the destination.
7. "Repair" OS X. Boot from the install disk as in point 5. and reinstall OS X. This should NOT erase any data, just replaces the system files which may have caused your booting problem. Now install the latest combo update for OS X and repair permissions on your drive with Disk Utility.
7.1. Install OS X into an external hard drive and then boot from it [8] and try to copy your data from the hard drive before proceeding. If you have done a backup recently, you don't have to do this.
8. Restore OS X from Time Machine backup. Boot from the disk that came with your Mac and choose the Time Machine restore option. This step will lose any changes made since your last backup but the system and your data will be put back to exactly as it was on that date.
8.1 Reinstall OS X. Boot from the install disk as in point 5. and select Disk Utility again. Now erase the whole hard drive and install OS X again. If you had a Time Machine backup and step 7 worked you don't have to do this.

My 2011 IMac will not boot up past the White apple logo screen with the whirly circle

My 2011 IMac will not boot up past the White apple logo screen with the whirly circle. I have tried various commands but to no avail. does anybody have any advice?

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

I just tried updating ITunes to the new version and it will not completely download and now I get an error message of MSVCR80

I just tried updating ITunes to the new version and it will not completely download and now I get an error message of MSVCR80. Is there a problem with the new iTunes version?
Now ITunes won't open.Help!!!

Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features(Later)
Remove all of these items in the following order:
iTunes
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support
Reboot, download iTunes, then reinstall, either using an account with administrative rights, or right-clicking the downloaded installer and selecting Run as Administrator.
See also HT1925: Removing and Reinstalling iTunes for Windows XP or HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
Should you get the error iTunes.exe - Entry Point Not Found after the above reinstall then copy QTMovieWin.dll from:
C:\Program Files (x86)\Common Files\Apple\Apple Application Support
and paste into:
C:\Program Files (x86)\iTunes
The above paths would be for a 64-bit machine. Hopefully the same fix with the " (x86)" omitted would work on 32-bit systems with the same error.
tt2

Imac will not complete reboot

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