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From: Jolly Roger <jollyroger@pobox.com>
Newsgroups: comp.sys.mac.system
Subject: Re: What's Wrong with My iMac?
Date: 12 Feb 2015 18:34:58 GMT
Organization: People for the Ethical Treatment of Pirates
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On 2015-02-12, Davoud <star@sky.net> wrote:
> 27", latest Yosemite, lots of RAM. 3-4 y.o., has been working
> flawlessly.
>
> The machine won't boot. After the startup chime a progress bar creeps
> along for a moment or so, then the Apple logo and the progress bar
> disappear and a gray screen appears. After a minute or two the machine
> reboots with the same results.
>
> Remedies tried: remove *all* peripherals. Attempt to boot from two
> different external FW drives that are known to have good systems, as
> both can boot another iMac and both were able to boot the ailing iMac
> before its troubles began. Results as above.
>
> I can run fsck, which reports no problems, but upon reboot the results
> are the same as above.
>
> When my wife first told me the machine had problems I was able to boot
> from the latest Disk Warrior thumb drive and rebuild/replace the
> directory. Now the machine won't boot from the DW drive.
>
> Gotta be a hardware problem, no?

What do you see just before the spontaneous reboot when you boot in
verbose mode? Or, if you can access the startup drive, it would be handy
to know what you see in the system log before the spontaneous reboot.

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JR