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Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Why is my iMac not booting up?

Since I installed the last Yosemite update (Version 10.10.5), my iMac will not fully boot up!

When it starts, the boot screen (Apple logo) and a progress bar appears. The progress bar fills up until its about 2/3 full then nothing happens. I have let it sit for days to see if it will finish booting and nothing happens. I have also tried the boot-up shortcut keys and nothing happens.

Can anyone tell me why this is happening? Will I need to upgrade my CPU?

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Will it boot from the original system installation optical disk?

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I have not tried booting from the original system disk. I have data on the drive that I would like to recover that, unfortunately, is not backed up. If I try booting from the optical disk, won't I lose all the data on my HD?

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Not at all. If it will boot from the optical drive, you can go to the second page pull down menu > Disk Utilities and see if you can repair the drive.

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Do you have access to a second Mac? Are you able to get your system into Target Mode and then connect it to the other system via a FireWire cable. If you can see if you can run Disk Utilities - Disk First Aid does it pass?

You also might have a North Bridge chip failure if you can't get the system in Target Mode. At that point you'll need to think things through do you want to replace the logic board or put the money into a new system.

If you have stuff on your drive you can take it out and use the IFIXIT Universal Drive Adapter to connect the old drive to your new or alternate Mac system.

Universal Drive Adapter Image

Product

Universal Drive Adapter

$24.99

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Thanks for the input Dan, unfortunately I do not have access to a second Mac. I may have to bite the bullet and upgrade to a new machine.

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Are you even able to get it into Target Mode?

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There is a way to get into separate screen on the boot up, there you will find drive settings and such, this happened to our Mac. And I watched a video on how to do it. If you just research it some more on how to get the the boot setup screen that should fix it. Keep us posted.

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gregtaylor will be eternally grateful.
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