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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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iMac startup stalling at 30%.

Hi my iMac is stalling during the startup process. Using any of the following methods the result was the same: progress bar gets to about 30% then stops progressing.

It has been left overnight in this state.

I have tried from built in HD, external usb HD and yosemite installer on thumb drive.

I have succesfully booted a macbook pro using the iMacs built in hard drive in target mode as the startup drive for the laptop.

So it does not appear to be a drive issue!

In verbose mode starting from recovery partition (on a cloned ext usb hd) it stops at:

Block Image

In verbose mode starting from tested clone of internal hd it stops at:

Block Image

Safe mode yields the same result.

In single user mode I can run fsck. No improvement.

Is this possibly a pram battery issue?

Answered! View the answer I have this problem too

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I should also note that I swapped back in my original ram just in case that was an issue but this made no difference.

I am trying to locate a copy of AHT for this machine to see if that will run of a thumb drive.

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I am now going to look at a newer iMac and see what is supposed to happen after wifi loads in verbose mode.

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Try running AHT from the original system installation DVD.

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Sadly I do not have those. Every install since and including Os 8 here but not the model specific ones for that particular machine.

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Is there another way to run AHT on this machine apart from System install discs?

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Dickon will be eternally grateful.
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