Imac shuts down while trying to boot up

My imac was running pretty bad on and of for most of the day. I decided to shut down and start up in safe mode. It got as far as white screen with apple logo and dial spinning. I left it for about 20 mins and nothing was happening. I shut down tried the same thing again... Still nothing after about 20 mins. I tried booting from the osx disc. I can here it reading the disc but after few minutes it just shuts down on its own. Has my hard disc finally died?

You can try creating a clone backup of your drive so you don't loose your data, but it sounds like a replacement drive is required.
Both of these applications can be used to create a clone. You will need an external drive to make the clone.
SuperDuper! http://www.shirt-pocket.com/
CCC http://www.bombich.com/download.html

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    Reinstalling OS X Without Erasing the Drive
    Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
    When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list.  Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility 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 Disk Utility and return to the main menu.
    Reinstall OS X: Select Reinstall OS X and click on the Continue button.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
    Also see:
    Reinstall OS X Without Erasing the Drive
    Choose the version you have installed now:
    OS X Yosemite- Reinstall OS X
    OS X Mavericks- Reinstall OS X
    OS X Mountain Lion- Reinstall OS X
    OS X Lion- Reinstall Mac OS X
         Note: You will need an active Internet connection. I suggest using Ethernet
                     if possible because it is three times faster than wireless.

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