Imac froze then wont reboot.

My imac froze whilst my iphone was syncing.
It wont boot up past the apple and spinning circle logo.
I have left this for 15 mins and it still wont reboot.
I managed to get the install disc in and use the disk utility.
It gave me the following messages.
Incorrect number of thread records.
Invalid leaf record count
(it should be 2001211 instead of 2001210)
Invalid volume free block count
(it should be 29872332 instead of 29872331)
It is now repairing the volume.
How long should this take and is there anything else I need to do so the mac will boot up ?

If it was me, before doing a full re-install, I would use a cloning utility (Carbon Copy Cloner or SuperDuper) to duplicate the internal drive to the external drive. Then try booting from the external drive by setting it as the startup volume in System Preferences +Startup Disk+ pane. This is a test to make sure it works and everything (especially your personal data) is there, like your internal drive.
If it runs smoothly (may feel a bit slower if that external is a USB drive) and those issues do not recur, the system may be fine. You can then use Disk Utility Erase tab to erase (reformat) the internal drive (be sure to select the internal DRIVE and not the volume indented below the drive in the Disk Utility sidebar). Then clone the external drive back it the internal drive. The reformat will get rid of the disk directory corruption error, so hopefully your previous system will work fine.
If the error caused problems with the system files (similar problems recur when booted from the external clone), you can do a full Mac OS X re-install on a freshly erased internal drive, then migrate your personal data from the clone on the external drive. In either case, the first step is to duplicate your internal drive to the external drive. The easiest way is to use one of those cloning utilities.
It is possible that there is a hardware problem with the drive. In most cases, the reformat will get rid of the problem, if it just corruption to the disk directory. You should monitor closely for a few weeks, because if the hard drive is starting to fail, a similar problem might happen again.

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It sounds like you need to make a trip to the genius bar to have them take a look at your computer

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Then you bought your iMac used and even though it had Mt Lion installed on when You Got It, it shouldn't have. The seller should of reinstalled the original shipping version of OS X on it before it was sent/given to you.
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My 17" intel iMac screen froze then has gone completely blank..
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Hi can anyone help?
Hi, my imac was loaded with Snow Leopard and I upgraded to Mountain Lion a few days ago and today when I got back from leaving it a few hours the screen went funny!!! (see pic) and it wont reboot. The same screen appears straight away when restarting. I have tried holding down the shift for safe start but it didnt work and also a nv/ram pram reset (but only heard one 'mac sound')
I have my old snow leopard disk..............somewhere!!! but I'm not sure if I can boot from them if I have just upgraded to Mountain Lion via the app store download??
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I'm afraid my next piece of advice you won't like. I think you need to erase the drive and reinstall Mountain Lion from scratch.
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:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on
the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on the Security button and set the Zero
Data option to one-pass. Click on the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
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How old is the iMac?
With no backup, you have probably lost all your data.
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Allan

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Try:
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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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The folder with ? mark mean one of 2 things.
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Do this:
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
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Eauddixon wrote:
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Looks like a Visit to an Apple Store or AASP (Authorized Apple Service Provider) is required...
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Two resets:
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.
PRAM RESET
Zap the PRAM
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Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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Release the keys.

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Imac froze then wont reboot.

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