Progress bar freezing computer on startup

I've looked through many threads, and can't find the same problem. I need to reformat my hardrive. I'm attempted to repair the disk from the install disk, and it fails and tells me to reformat the drive. When I reboot for normal start up so I can back up, I now get a progress bar that freezes part way through, and eventually just shuts my computer down. The progress bar is freezing at the same point that it the verification was freezing, so I assume it's inhibiting the start up. My question is, is there something I can do in single user mode that will let me onto my computer?

If you have tried a safe boot(power up holding the left shift key, which takes longer) if you can do this and it works do a back up. If no success, your drive may have failed, there is some recovery software out there, but it is expensive (Disk Warrior) for an example, there are others, but depending on how long it has been since your last B/U and how valuable the data is you can also go to a data recovery specialist (Killer expensive)
If no joy from above take it to an Apple Genius bar and see what they may be able to do for you, diagnosis is free.
Maybe someone else can chime in here with more advice/suggestions.
I truly wish you the best

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Thank you gchin.
I emailed apple support and they got back to me, I did what he said and it's fixed! SOLUTION found- see below.
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They replied:
"Greetings from Apple iTunes Store Customer Support! I am ########.
I understand that you have had issues accessing the iTunes Store. I know how eager you are to have this issue resolved. I will certainly assist you.
#########, for this, I recommend that you attempt to resolve this issue by once again uninstalling iTunes and QuickTime, and then reinstalling the latest version of each. To do this, first ensure that you are logged in to an Administrator user account on your computer, then follow the instructions in the appropriate article:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista:
http://support.apple.com/kb/HT1923
Note: Titles you purchased from the iTunes Store or imported from CDs are saved in your iTunes folder by default and are not deleted by uninstalling iTunes. Backing up your iTunes Library regularly is recommended.
After successfully uninstalling iTunes and QuickTime, please ensure you have upgraded to the latest Service Pack for Windows by installing all updates available to you on Microsoft Windows Update:
http://update.microsoft.com
Once you have the latest Service Pack for Windows installed, download and install iTunes for Windows (which includes QuickTime):
http://www.apple.com/itunes/download
If you continue to experience difficulty with this issue, you may wish to contact Apple technical support. A representative will be able to tell you about Apple's complimentary and fee-based support options and can help you determine which option might be most helpful.
Please find the appropriate phone number here:
http://www.apple.com/support/contact/phone_contacts.html
Thank you for contacting iTunes Store Support. Have a nice day!
Sincerely,"
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My computer will not start up. It powers up I get the gray screen with the apple and get the loading progress bar it loads to 25% and the screen goes black

My computer will not start up. It powers up, I get the gray screen with the apple, then the loading progress bar starts loading to about 25% the the screen goes black. what can I try to get my computer up and running?

Carolyn Samit wrote:
iMac, Mac OS X (10.7.1)
Use Command + R for Lion Recovery
Try restarting, when you hear the startup tone hold down the Option key. Then choose the Recovery Partition.

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Hi,
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http://i49.tinypic.com/2rxjpd3.jpg
Message was edited by: RobinZ.

HI and Welcome to Apple Discussions...
Boot from your install disc and run Disk Utiity to see if there are errors on the startup disk that need repairing.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
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Select First Aid in the Main panel.
*(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)*
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
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*" because all my photo's are on it, etc."*
If you can get the iMac to boot normally I suggest you back up those photos and any other important data to an external source ASAP in case there's a problem.
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Carolyn

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It's a bug of Lion. The same is happening to me. After turning off the computer, the gray bar appears and the login screen. Then i don´t have wifi or bootcamp partition. I have to reboot. I hope Apple fix it soon.

Progress bar freezing computer on startup

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