My imac will not restart after updating itunes. What do I do?

I have just updates iTunes to use my new iPod nano. The computer attempted to restart and I have been left with the grey apple start up screen. Is there anything that I can do to resolve this?

See if you can get back in with a Safe Boot. Shutdown (hold power button in until it does, if necessary), hold down Shift at the startup chime and give it much longer to boot. Might try repairing Permissions while in Safe Boot, from Disk Utility. Also Verify Disk. No need, as Safe Boot should do this.
After doing that, and if it will then boot normally, get the iTunes update from Apple Downloads and reapply it.
If it was the 11.01, get it here.
http://support.apple.com/kb/DL1614

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Disk Utility suggest reformating
Reformatting is not a Recovery Aid. When Disk Utility suggests reformatting, it is because it considers your drive unsalvageable. Yes, you lose all the data on the drive when you reformat.
And yes, Mac OS X Extended, journaled is the method you will need for a Mac OS X Boot drive.
You should also consider buying a replacement drive to have on hand the next time this internal drive gives you the slightest bit of trouble. Possibly an external enclosure to put it in as well. and it would not hurt to go ahead and Install Mac OS X on it and try booting from it, to make sure it is ready.
And make sure your Backups are current, as the next time that internal drive screws up you may get no warning whatsoever.

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Actually my MacBook pro is 2011 model! I managed to install Lion on an external disc and start my MacBook from it. Although the internal disc is seen I cannot retrieve my data. Anyone knows how I do that please?

Itunes will not open after update, itunes will not open after update

i have just updated itunes following trying to link my apple tv to itunes on my computer. i was advised an update was required first, agreed, and have not been able to open itunes since.

Well then I would attempt a complete uninstall and reinstall of an earlier version of iTunes-
should be able to find one somewhere. Also review your automatic system restore settings
for future problems. I have used system restore multiple times for issues like this.
It really is a quick fix.
Do you have an Apple Store somewhere near where you live? You could make an appointment to
talk to a tech there. I think that's free.

Apple TV Will Not Restart After Update

My apple tv (3rd gen) showed the connect to iTunes image on the screen. I Plugged it into my Macbook Pro and restored the apple tv. No error codes were present. It seems to restore successfully. The problem is when I plug it into the tv the apple tv never boots fully. It just shows the apple image and the led on the front flashes. It seems like it didn't get a full restore or something.
I have also tried restoring it on my PC Desktop thinking maybe there is a problem with iTunes on my macbook.
has anyone ran into this? Ive called support and they said they have never seen this before. My next step will be the genius bar if i can't figure it out on here!
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Check that you have correctly followed the instructions for your model of Apple TV.
If not already, try using a powered USB port.
Repeat the process but this time try connecting the cable while iTunes is closed.
Repeat the process with another cable.
Try restoring the Apple TV on another computer in another location.

My phone will not restart after updating it today with the new update provided by apple. My carrier is verizon

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Put the device in DFU mode (google it) and restore via iTunes.

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Hello KCC4ME,
You may try booting your Mac in Safe Boot, as it can resolve many issues that may prevent a successful login.
OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/HT1564
If a Safe Boot allows you to successfully log in, you may have issues with one or more login itmes (while the following article is labelled as a Mavericks article, it is viable for earlier versions of the Mac OS, as well).
OS X Mavericks: If you think you have incompatible login items
http://support.apple.com/kb/PH14201
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Allen

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XP instructions in the following document: How to perform disk error checking in Windows XP
Vista instructions in the following document: Check your hard disk for errors
Windows 7 instructions in the following document: How to use CHKDSK (Check Disk)
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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. Alterhatively, 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.
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My imac will not restart after updating itunes. What do I do?

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