OS X 10.10.3 can't boot past startup screen

I've updated my 2009 iMac to OS X 10.10.3 and it can't be booted to the login screen after that. The progress bar will be stuck at 50% forever on the startup screen — the longest I've waited was about a day and the iMac was really hot as well. I tried getting into Recovery Mode and did a disk repair and it managed to repair 4 permission errors, but there's one permission that persisted and it says (Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired). I rebooted again but it still can't boot past the startup screen.
Unfortunately, I can't reformat OS X because my backup copy from Time Machine has been outdated for a few months as I haven't bought another backup drive to continue using it.
One of the options that I could think of is to reinstall another copy of OS X from Recovery Mode, as it is able to retain my data files. But the problem is that my iMac has only 5 GB of free space, and it doesn't allow me to do that. Is there a way to use the Terminal in Recovery Mode to delete some of my apps and files so that I could install a copy of OS X? Or are there any other ways to solve it?
Any help will be greatly appreciated. Thank you.

I've managed to solve this issue by using a very simple and straightforward method.
I remembered Macs have this nifty feature called FireWire Target Disk Mode by pressing and holding "T" on the keyboard the moment you turn it on. So I went to get myself a FireWire 800 cable and connect it to my MacBook Pro, activated FireWire Target Disk Mode on my iMac (Target) and browse the files from my MacBook Pro (Host). I deleted some files, recovered some free space, disconnect, reboot, reinstall OS X in Recovery Mode and — voila! — my iMac is back running OS X Yosemite with all my data files and settings again.

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Macbook 2,1 can't boot past white screen

I was restarting my computer to clear out the memory and whatnot and now the computer won't boot past the white screen. Unfortunately I have a DVD in its drive and can't get that out. I've resetted the PRAM, held down the option key, and even tried to boot from an external. I have taken it to the genius bar today and they said the hard drive was failing. I put the original hard drive back into the computer and still get the same thing. The drive that was in it is now in an external case and works with my Linux computer. Unfortunately, I can't access the files with my old Mac G4 since the Macbook had Lion installed on it, and all music, iPhone apps are associated with the newer system.
Is there anything else I can try? Will I need to have a new motherboard installed?
Thanks.
BTW, don't worry, I am saving to buy a new Mac as soon as I can.

Trackpad button does nothing
Option key does nothing
PRAM resetting at least reboots the computer
Startup chime - normal
Shift key - nothing
If removing the internal drive and booting from an external would do anything I'd certainly try that.
Since the computer is 6 years old, ironic since I'm typing this on my old G4 tower, it will be replaced with a Mini since I no longer have a need for a laptop. It's also out of warranty and will probably not be worth the cost to get it fixed.
The geniuses at the Apple store suggested I buy a new hard drive and that would solve my problems. I highly doubt it since I've put another drive in and it's doing the same thing.

10.5.8 Both hard drives OK, tested - will not boot past startup screen

Okay, I have an early 2008 MacPro, and everything has been running fine, but I was trying to search for something in Finder, and it wouldn't show up, so I checked my other hard drive's permission options - it displayed "Custom" for all users, when I know I had them all set to "Read & Write" previously, so i changed my main user's (on my newer HD on 10.5.8) permission to Read & Write on the original HD with 10.6.8, so I could search its contents, then these error messages poppped up, everytime i hit OK, a new one popped up immediately in its place, with some "Apple AUD" OR "HD" messages (can't remember the exact messsages), so I restarted my computer and now I cannot get past the apple logo screen.
- Attempted selecting both hard drives as startup discs and still hangs at the white apple logo screen.
- I tried booting into Safe Mode and it loads the status bar, and when it's done loading, it simply goes back to the spinning gear.
- Tried booting from my 10.5.8 installation disc and it works, both of my HD's tested "OK" when I verified them.
- Tried resetting PRAM, and even reset SMC, and the problem persists.
One last note: the original HD that came with my Mac Pro, which has 10.6.8 on it as of last year, has a tiny lock icon on the left of the little hard drive graphic.
I'm stressed because I use LOGIC a lot, and I have all of my music projects on these hard drives, and over a million files between both of them. I'd pull my hair out, if I hadn't just shaved my head for summer
Any help would be GREATLY appreciated!

Your hard drives may be OK, but the installed systems are not. You need to reinstall OS X on your startup volume. Doing this with Leopard requires your Leopard DVD:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) 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 and/or Tech Tool Pro 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.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

HELP... after 10.4.11 update I can't boot past the blue screen

HELP... after 10.4.11 update I can't boot past the blue screen, and it is pretty frustrating, to say the least. Here's what happened last night:
I installed elgato's eyetv 250, and at the end it asked to update the software. I did so, and when I tried to run it again it said I had to be running 10.4.11. I quickly went over and downloaded the 10.4.11 combo updater to my desktop and proceeded to repair permissions on my disk so I could run the updater.
I repaired permissions and started the updater. It got halfway through updating and said something like it could not finish and stopped. No reason why - it just stopped. I tried it again, and it did the same thing after going about 25 to 30 percent through the updating process. I thought that was very odd, so I checked, and I was running 10.4.9.
I thought I needed to get the 10.4.10 update, so I downloaded the combo updater several times. It would not run, giving me some error message that it would not even open, so I thought I needed to restart my computer to get it to run. I did so.
That's when my computer would not boot. It gets through the initial white screen with the logo in the middle and the revolving circle, and while it stays there for a long time the fans run increasingly faster. They tame down, and then the blue screen with "Mac OS" on it and the blue progress bar comes up. There is no blue progress bar, though... that's where it stops and will not go any further.
Can ANYBODY help me get this thing booted back up? It was so late last night that before I started I didn't back the Mac up, and of course I have a project on there that I need to finish Saturday afternoon for a company.
ANY HELP WILL BE SO GLADLY APPRECIATED. If you can give me step by step instructions on what to do, you will surely be blessed! Thanks for any help,
Barry
Jeremiah 29:11

Hi mrstang, and a warm welcome to the forums!
It sounds like Disk Directory problems.
Could be many things, we should start with this...
"Try 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."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot , (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it finishes.
The usual reason why updates fail or mess things up, or things don't load/run, is if Permissions are not fixed before & after every update, with a reboot... you may get a partial update when the installer finds it doesn't have Permissions to change one obscure little part of the OS, leaving you with a mix of OS versions.
Some people get away without Repairing Permissions for years, some for only days.
If Permissions are wrong before applying an update, you could get mixed OS versions, if Directory is the slightest messed up, who knows!
If many Permission are repaired, or any Directory errors are found, you may need to re-apply some the latest/biggest updates again, or even do an A&I if you have enough free disk space.
The combo update for PowerPC-based Macs...
http://www.apple.com/support/downloads/macosx10411comboupdateppc.html
The combo update for Intel-based Macs...
http://www.apple.com/support/downloads/macosx10411comboupdateintel.html
Repair Permissions before & after re-install, then reboot again each time.
If all the above do not resolve the problem, then it's time for an Archive & Install, which gives you a new/old OS, but can preserve all your files, pics, music, settings, etc., as long as you have plenty of free disk space...
http://docs.info.apple.com/article.html?artnum=107120
Be sure to use Preserve Users & Settings.

Hard drive issue, can not boot past disk utility

I got off work this morning and was wanting to do a clean install of osx10.10, unfortunately I did something bad, with my lack of sleep. I think I canceled the operation when I clicked cancel during the reinstall of OS X. Now I can not boot past the disk utility screen. There is also no sub menu under my listed hard drive "Macintosh HD." Is there a way I can fix this?
It's a brand new MBP, 15inch retina. I had it for only a week and I am at work right now. So if there is anything I can do from here that would be great!!
I also tried to reinstall OS X from the disk utility and when it asked to select disk to install OS X my only option was the recovery HD

Ok, I will try that. I still have my old MBP that I am supposed to be trading in. Good thing i haven't mailed it off yet.
I just reset the SMC and Pram and tried to boot in recovery. Once it downloaded everything online and i went to install OS X, it asked me to select and disk where i want to install. Well, there wasnt a disk listed at all...
So, now I will try to create a USB installer when i get home from work and try that out. I will keep you posted
Thanks,
Keith

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

IMac Does not boot past Gray Screen

iMac does not boot past Gray Screen. 2008 24" Intel iMac running Mountain Lion with 1TB hard drive.
Problem started yesterday while I was web surfing, and my iMac frooze and shutdown. I rebooted and could only get as far as the gray screen.
On bootup the following things happen:
Startup tone
Gray screen with Apple, and gear spins below Apple.
Once the gear stops spinning, nothing happends.
Troubleshooting steps I have tried:
removed all devices connected to iMac and rebooted, but same symptons occur.
booted into Safe mode and run disk utilites.
     Disk Utilities found no errors on the drive, but did find two permission issues that it was able to fix.
          First permission issue:
                   "Group differs on library; Should be 0; group is 80"
          Second permission issue:
                    "Permissons differ on library; Should be drwxr-xr-x; They are drwxrwxr-t"
Disk Utilities says it fixes these issues and then I reboot, but get the same problem.
I reboot back into Safe Mode and run Disk Utilities and it discovers the same problems listed above with Permissions. It says it fixes them, I reboot, but the same problem occurs. Its as if we are stuck in some sort of loop process.
Booted into Single User Mode and ran the following command:
     /SBin/fsck -fy   it reports back, Volume Apprears to be ok.
I reboot, same issue !
Performed SMC Reset, Rebooted, same issue
Performed PRAM Reset, Rebooted, same issue.
Booted into Recovery Partitioin (Command R) and ran disk utilities. It found the same permission issues listed above. It fixed them. I rebooted. Same problem still.
While in safe mode, I preformed a full time machine backup.
I am out of ideas. Any help would be greatly appreciated.

Hello,
I reboot back into Safe Mode and run Disk Utilities and it discovers the same problems listed above with Permissions.
You can ignore repeated "fixes" it's not really a problem, if it says completed repairs that's all that's needed.
Luckily it boots in Safe Mode, here's basically the steps to try to find out what it is...
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons
Though I'm suspecting some corruption to your OS at the moment.

Macbook keeps restarting, can't get past icon screen

I had to correct my permissions because I couldn't edit my address book and ical. Everything was working fine last night after I did the permission fixes. But when I booted up my Mac tonight, the farthest I could get was the white screen with the Apple icon and the animated circle. After a few minutes, the laptop will reboot itself and continued to do that for 30 minutes. I can't get past that screen. What is going on? How do I fix this? I finally turned off the Mac and am using my Dell.

The question mark on the file tells you that your MacBook wants to start up but can't find a viable OS to start from. Can you start up from the DVD that came with your Mac? If so, go to Disk Utility and see if you can repair the internal hard drive. If you can't see the hard drive from within DU, your drive may have failed, and you may need to replace it. Good luck.

G5 won't boot past grey screen

G5 2.0 Dual will not boot past grey screen. Running 10.5.8 on an old maxtor 160gb drive, drive is available as a startup disc in StartUp disk in system preferences. But when it is chosen the machine shuts down in the usual manner then switches to the maxtor disk and only gets to the grey screen with the apple log no progress clock appears. Using disk utility from install disk reports that drive is ok, running techtool pro 4.6.2 reports the drive is fine and all file structures, volume structures and directories are fine. So of course i am keen to find out what the issue is and wether it can be resolved without resorting to a clean install. When booted from another internal drive the icon for the errant drive is visible and all files and folders are visible and readily accessable.
It would be great to get back to booting from this drive as it is the main drive I use and has so much more on it than the secondary drive.
Any help will be of immense use
Thank You

I assume you have already tried a PRAM reset. If so, then the following three items may yield a clue.
Number one thing to try is a Safe Boot by holding the shift key down at boot. You may have a something in the non-minimal Apple kext set that is causing the hang. (If it safe boots, you may have a problem in kext caches which can be cleared. See below.)
Second is to disconnect all peripherals except monitor, keyboard and mouse and see if something there is contributing to the hang.
Third is to use verbose boot (hold down cmd-V at boot until you see a black Unix terminal screen come up) and see where the system is hanging.
Clearing the kext Caches (if indicated)
This is probably easiest done booted from the other drive, so I'll describe that method.
Open the Maxtor's System folder, then open the Library folder and drag the following two files to the trash:
Extensions.kextcache
Extensions.mkext
Empty the trash.
Open a Terminal session from the Terminal application in the /Applications/Utilities folder.
Type cd followed by a space in the command line and then drag the icon for the Maxtor into the window, which will put a properly formatted Unix path into the command line, then press the return key. Type the following three commands
cd System <cr>
cd Library <cr>
sudo touch Extensions <cr>
then give your password when requested and close the terminal session. Select the Maxtor as the statrup drive in System Preferences and give it a go.

My iMac won't boot past grey screen and it didn't come with a os x disk

My iMac won't boot past grey screen with apple. I've tried booting in safemode but that didn't help and my iMac didn't come with a os x disk.

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.”
b. 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.
c. 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 either of the techniques in Steps 1b and 1c 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 10. 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
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 10
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 11
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 12
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.

On my wife's iPad mini I can't get past the screens accepting the software license to upgrade over WiFi

On my wife's iPad mini I can't get past the screens accepting the software license to upgrade iOS over WiFi.
Works if I do it over iTunes on my desktop.
I get the screens to agree to the software license (twice) then it sits there until I get impatient. like 30-60 seconds. Have tried a hard boot but have to connect it to the computer each time. Latest was when I upgraded to 8.2

Solving the iTunes Installation Problems in Windows
1. Apple has posted their solution here: iTunes 11.1.4 for Windows- Unable to install or open - MSVCR80 issue.
2. If the Apple article does not fully resolve the problem for you, then try Troubleshooting issues with iTunes for Windows updates - MSVCR80.

Computer won't boot past gray screen

I can't get my computer to boot past gray screen. It keeps showing the apple logo and the spinning wheel. What can I do to get into my system?

Startup - Gray, Blue or White screen at boot, w/spinner/progress bar
Startup - Gray Screen
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I recently installed iTunes on my new HP laptop computer, authorized it according to the instructions, but now can't get past a screen that tells me that I need to authorize the computer. I purchased an album and it's in the library, but it won't sync.

I recently installed iTunes on my new HP laptop computer, authorized it according to the instructions, but now can't get past a screen that tells me that I need to authorize the computer. I purchased an album and it's in the library, but it won't sync.

Have a look here...
http://support.apple.com/kb/TS1389

I can't get past white screen when starting up, any ideas?

I Can't get past white screen when starting up, any ideas

http://support.apple.com/kb/TS2570 Mac OS X: Gray screen appears during startup
===============
When posting in Apple Communties/Forums/Message Boards.......It would help us to know which Mac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
CLICKY CLICK---> https://discussions.apple.com/docs/DOC-3602
CLICKY CLICK-----> Help us to help you on these forums

My old iMac and OS 10.4 will not accept the New iTunes Version 10 application and I can't get past the screen offering to download iTunes 10. This is wrong and I need help getting past this situation. Help!

My old iMac and OS 10.4 will not accept the New iTunes Version 10 application and I can't get past the screen offering to download iTunes 10. This is wrong and I need help getting past this situation. Help!

Sure, you can get around it if you don't need the newest version of iTunes. I still use version 7.5 because the newer versions didn't strike me as offering anything I needed.
If you do need a version 10-something then you will have to upgrade your operating system to Leopard (fi your computer will support it) at least. If you need 10.5 for some reason then there's no getting around it, you will have to buy a new computer.

OS X 10.10.3 can't boot past startup screen

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