My mac pro stuck on startup screen after i update the itunes

please help me on my mac pro, after i update the itunes into a new version, i restart it and then it stucks into gray with the apple logo and some words/ letter about error appear in the screen

Hello jaydenmarcus,
The following article provides some useful information and troubleshooting steps that can help resolve recurring kernel panics.
OS X: About kernel panics
http://support.apple.com/kb/TS3742
Cheers,
Allen

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Mac Pro stuck on gray screen after installing software for a new keyboard

I am having a huge issue with my very important work computer! For a few weeks, my Mac has been freezing on the gray screen during start up. Since I had two external hard drives plugged in, I would unplug one of them and the Mac would always restart correctly once one was unplugged. Well today I was installing software for a new keyboard and the mac prompted me to restart. Once I restarted, the gray screen came up again and no matter what I did it would not start up correctly again. I tried unplugging everything except the keyboard and monitor and nothing works. I tried ejecting the crash-causing CD with the keyboard using all of the commands I found on this forum board and nothing worked. I saw forums about manually ejecting the CD by pushing a pin-hole but I cannot find that pinhole anywhere! Then again, the CD might not even be the problem but since the computer gave me the gray screen of death right after using the CD I am thinking that it is the problem. I use this computer for editing a TV show and creating websites so there is a ton of files on it and I need to get it up and running again ASAP. Any suggestions would be appreciated and I am sure by now you can tell that I am not a Mac expert so please dumb it down for me. Thank you!!

I would start by breaking your thoughts and sentences out from one long paragraph.
Start at the basics.
Always have backups.
One at least that is a spare boot system you can use.
Clone your system. SuperDuper does a great job for only $29
Boot from another hard drive or last OS X DVD
Repair your drive with Apple Disk Utility along with 3rd party disk maintenance and repair
Hold Option key until the boot manager, then hold mouse to open optical drive.
You can hold mouse on startup and it will eject also.
Hold and continue to hold Shift key during startup to repair the boot drive in minimal fashion.
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Fill in Mac OS X version and more about hardware would help in posts and in your profile signature.
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I literally got it an hour ago and when it was updating it got stuck on the startup screen. I've tried turning it off and on but it still wont load. Help

I'm not going to read that huge rambling post, sorry.
But you can look through my user tips here
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/

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It was stuck on the Windows 7 welcome screen, all I had to do was hold the power button down for longer and restart it properly. I was just concerned as they always say not to turn the computer off during an update.
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After installing Mountain Lion my Mac restarted and has been on the startup screen (apple logo with loading icon spinning) for the last hour... I'm assuming this means my hard drive crashed during the install? What ***** is this happened when I installed Lion the first time. Wasn't a cheap fix and lost everything.

Similar if not the very same issue with my late 2009 iMac since upgrading to Mountain Lion.
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Someone in another post added the following:
Open console in Applications>Utilities, check the system log for the date/time of the last problem startup for clues.
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Firstly, some details to save questions later:
Mac Pro 2006
Snow Leopard (latest update)
After using my Mac Pro as normal last night (no issues whatsoever), I go to boot it up today to find it is stuck on the white screen just after the Apple logo.
My first thought was that my OS drive had kicked the bucket and I'd need to resintall the OS. No biggie. So I attempt to boot from disk, holding "C" whilst booting - the same issue. Goes from the Apple logo to blank white screen.
So I try to boot from disk by holding Alt whilst loading to select drive and boot from the disk there - this time we just get stuck on a blue screen.
Strangely enough, the original OS drive DOES show in the list of available drives.
I have also tried booting in safe mode to no avail.
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Can anyone else offer any suggestions?
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The simplest thing your Mac can do is Alt/Option boot, because all the code for that function is in ROM. In that case, there is no Apple logo that appears, and the screen only goes to the list of available possibly-bootable Volumes, arrayed across the screen. If you are seeing the Apple logo (which is loaded off a Drive) you have not succeeded in Alt/Option booting.
Sometimes having the keyboard plugged into a Display or other Hub can cause the "snag keys" to be missed at Startup, and be ineffective.
If something interferes with your ability to Alt/Option boot, it is most likely to be the contents of your Hard Drive. If desperate, pull out the Boot drive and see if you can Alt/Option boot with only the DVD in the drive.

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My Mac Pro is stuck at Gray Screen. When I reset PRAM, it loads the OSX Utilities screen, prompting me Restore from Time Machine, Reinstall OS X, Get Help, or Disk Utility. I ran Disk Repair and Repair Premissions, same thing.... stuck at grey screen.
What will happen to the data on my HD if I choose to Reinstall the OS X? IS that the best choice? Thanks.

Off hand I think your drive may be bad. But to find out you need to erase the drive, so you will need to have a recent, bootable backup.
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
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2. After DU loads select your startup volume (usually Macintosh HD) from the
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3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
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4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
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Mac Pro (early 2008) black screen after 2015-004 Mavericks security update

Hi,
My Mac Pro (early 2008) does not start up after 2015-004 security update last week. I can't
get anything on my monitors. I can hear it starts booting, but not sure if does so fully, because the screen
stays black. Have tried all the different booting options, e.g. safe boot, but no effect. Is there a way to revert
the update or even do a clean OS install, even if I can't see anything on the monitor?
I just noticed that Apple has released a supplemental update today for Yosemite 10.10.3,
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Try booting to Recovery and repairing the the startup disk via Disk Utility.
OS X: About OS X Recovery - Apple Support
Next try resinstalling the OS
OS X Mavericks: Reinstall OS X

Macbook Pro stuck at startup screen.

I've ran Disk Utility, there were problems that were fixed, but it's fine now (I've ran it again to double check), and I've ran Apple HHardware Test and I received" no trouble found".
But everytime I try to start up it gets stuck on the grey startup screen with the apple and the oration under it. So I'm at a loss at this point.
Thanks for any help you can offer.

System files are missing or damaged so you need to reinstall OS X:
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard 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 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.
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. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.
If you have an earlier version of OS X installed then do this instead:
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.

Stuck on startup screen after 10.9.1 update

so, my app store had been bugging me to do updates for about a month and I finally did them today. Then, Google Chrome kept crashing every time I tried to open it so I rebooted into recovery mode and ran the disc verification. It got stuck on the startup screen, so I tried to restart it again... got stuck on the startup screen again... went back into recovery mode and repaired permissions and now it's been stuck on the startup screen for 1/2 an hour. Help??

Jamie,
Since your wife knows how to use the installer DVD for maintenance, ask her to do a "Repair disk" on the startup drive. (Repairing permissions is something else.) However, also ask her if by 'no effect' she means repairing permissions could not be done or reported no permissions problems with the drive. If the latter, it is good news in that it at least means Disk Utility found a valid system to check permissions on. Anyway, let us know the results of the repair disk step, particularly any messages about repairs that were attempted.
It is unfortunate that you don't have some files backed up but hopefully we can get your Mac back up to speed without losing anything. If they are highly critical files, you may want to consider waiting until they can be offloaded to another Mac using Target Disk Mode or similar techniques, since any write to the drive has some (if generally very small) chance of overwriting data.
Be aware that there have been some reports of problems associated with certain scanners & external drives, & not just with this update. I have no firsthand experience with this, so I can't tell you exactly what they are, but I suggest you disconnect them until the problem is resolved.
Hopefully, these three steps will get you closer to a fully-functioning, bootable Mac, but either way, keep us informed.
Oh, one other bit of advice in the meantime: if you haven't already, give an authentic, Chicago deep crust pizza a try before you leave. I like Pizzeria Uno or Due, but there are others.

MacBook Pro stuck at grey screen after Yosemite upgrade

upgraded to yosemite yesterday. Reboot and stuck at grey screen(login in page) when i log in there is some codes thing at the left top corner of the screen. and then it reboots again. Which means I can never log onto the computer. what should I do

If you can't start up and log in in the usual way, try in safe mode.
During startup, you’ll see a progress bar, and then the login screen, which appears even if you normally log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Log in as an administrator to carry out these instructions. If you have only one account, you are the administrator.
☞ If you don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
Safe mode is slower than normal, and some things won’t work at all.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t start in safe mode.
If you're able to log in, launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
In the Console window, select
DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
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View ▹ Show Log List
from the menu bar.
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I know the report is long, maybe several hundred lines. Please post all of it anyway.
In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
Please don’t post other kinds of diagnostic report.

Power Mac G5 stuck on grey screen after swapping machine

Greetings Friends,
I have changed my two HD out of one casing to another casing. Both HD worked fine, Both machines worked fine.
I have booted up the computer and now the computer sits on the Grey apple logo, with no loading wheel. After 2 mins, the fans kick into overdrive.
It does not boot.
I have tried alt + command + P + R, but it does not work
I have tried holding ALT down on start up of the machine, which directs me to a menu where I can select either one of my HD or the start up disc that is in the optical drive. I have tried selecting all of these with no success.
I then tried to swap all the internals back to the original machine to see if it still works, and now the same problem exists. Grey screen with APPLE logo, no boot.
Could any body give me any help or direction. I love these machines and would like to continue working with one of them as soon as possible.
They are a G5, 4 GB ram, OSX 10.5.8 & the other drive is 10.5.1.
Both have been working well until today.
Thanks.

Hello, first thing that comes to mind is a BAD HDD, does the other one boot with only the one original drive? Maybe I'm misunderstanding if it was added in the second slot or not!?

IPhone 5 will not boot up past startup screen after attempted update to iOS 8. Not recognized by computer.

Like everyone else today, I attempted to make the move to iOS 8, using my Mac's iTunes. All was running smoothly, the progress bar was nearing the end when I received the error that "the iPhone software update server could not be contacted." With a now useless phone, I restarted it, hoping for the best as I could do nothing. I am now stuck with a phone which will turn on to the white startup screen and black Apple Logo, then instantly shut down, leaving me to repeat the process. If I hold down the home button, I can enter what seems to be "Recovery Mode," with a red iTunes Logo, as opposed to the usual blue. From here, all internet sources I have found suggest that I should restore the phone, but that's really where I hit the problem. When I plug the phone in, when in Recovery Mode, I simply receive the "iPhone software update server could not be contacted" error again, leaving the phone not recognized by iTunes. In non-recovery mode, the phone appears to simply turn off so fast that iTunes has no time to find it.
Any one with similar problems or solutions?

This what happened to my iPhone 5 after I updated to iOS 8.0;
The update process was done smootly without problems thru
Over the Air.
Now when I cold start/boot my iPhone 5, my apple logo appears as it was
in iOS 7, but after 30 seconds or so, my Apple Logo dissappears the
screen goes black for 5-6 seconds, but then viola! I am at the Log-On
screen... Then I start using my iPhone.
Just like Chris above, I have done 10 reboots, (complete shut down and
restart), its always the same...
Other than this, my iPhone works just fine. I will not re-install the iOS.
From my past experience, re-installing the iOS does not change
these minor differences...

IPOD stuck on loading screen after ios6 update!!

My ipod is stuck on the loading screen after updating to io6, when connected to the computer it is saying updated, but it stuck and remains on the update loading screen.

If not successful try the remaining items of:
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My iPod is stuck on a screen were it shows the itunes symbol and it show i need a plug in device. Ive tryed everything I can do can anyone help me?

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This happens when the operating system on the phone becomes corrupted. This could be because of a failed update to the OS or even a hardware failure due to being dropped or submerged in water. If you follow the instructions indicated, hopefully iTunes will be able to restore the OS and afterward you can restore the settings from a backup (assuming you have one).
If this does not solve the problem you will need to take the phone to an authorized repair center.

My mac pro stuck on startup screen after i update the itunes

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