iMac Boot failure on Yosemite

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Level 1

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iMac Boot failure on Yosemite

Hi,

My 2009 iMac has been running great recently but then it suddenly started to stop halfway through the boot process and switch off. I have an image that shows the error messages produced. I have tried running Disk Utility to repair the disk and that says everything is ok. Safe mode does not work.

However the disk seems fine as I can access all the files on my Mac by using the Windows partition, which runs perfectly and is what I am using now to write this. So obviously there is an issue with OSX. I am fairly comfortable with terminal and Single User mode, so is there anything I can modify to force the boot to work? Even if it just to get on a few times before reinstalling.

Sorry for the poor quality image but it was taken on my phone and I have a few seconds before the message disappears.

Thanks,

Gareth.

iMac, OS X Yosemite (10.10.4)

Posted on Jul 5, 2015 4:13 PM

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Answer 1

SeaPapp

Level 7

26,486 points

Jul 5, 2015 4:36 PM in response to Gazmatron1

Have you tried to just reinstall OS X from your Recovery partition?

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Answer 2

Linc Davis

Level 10

209,541 points

Jul 5, 2015 5:12 PM in response to Gazmatron1

It's failing the power-on self test, which indicates a hardware fault.

Make a "Genius" a ppointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.

Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.

If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.

Keeping your confidential data secure during hardware repair

Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.

*An SSD doesn't need to be zeroed.

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Answer 3

Gazmatron1 Author

Level 1

0 points

Jul 6, 2015 1:36 AM in response to Linc Davis

Thanks for the help.

If this is a hardware issue then how come I can use software on my Windows partition to fully access my Mac HD Drive. I am using this now to backup files to USB memory however if it was a hardware problem would this not be possible?

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Answer 4

Linc Davis

Level 10

209,541 points

Jul 6, 2015 5:49 AM in response to Gazmatron1

Windows probably ignores the results of the POST. I'm going by what's shown in your screenshot, which says "POST Integrity test failed."

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