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Sigh. Mac Pro won't boot.
#27
It's getting to the same point in the boot process and failing on both internal and external boot systems, indicating some kind polling problem - something's not answering correctly. But that could be a software issue (broken file) or a hardware issue (something like an add-on card or even a bad stick of RAM). It's hard to tell.

Age is a factor, so if you haven't already done so, check your RAM by pulling/replacing one stick at a time.

Sometimes a dying (but not yet dead) drive will cause this problem at start up too…

These've all been mentioned, but they seem like the most likely culprits.

Good luck.
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Messages In This Thread
Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 04:28 PM
Re: Sigh. Mac Pro won't boot. - by neophyte - 05-25-2017, 04:46 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 04:52 PM
Re: Sigh. Mac Pro won't boot. - by WHiiP - 05-25-2017, 05:06 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 05:12 PM
Re: Sigh. Mac Pro won't boot. - by billb - 05-25-2017, 05:18 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 05:33 PM
Re: Sigh. Mac Pro won't boot. - by anonymouse1 - 05-25-2017, 05:52 PM
Re: Sigh. Mac Pro won't boot. - by GGD - 05-25-2017, 05:56 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 06:15 PM
Re: Sigh. Mac Pro won't boot. - by Mike Johnson - 05-25-2017, 06:16 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 06:21 PM
Re: Sigh. Mac Pro won't boot. - by AllGold - 05-25-2017, 07:14 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 07:44 PM
Re: Sigh. Mac Pro won't boot. - by anonymouse1 - 05-25-2017, 09:56 PM
Re: Sigh. Mac Pro won't boot. - by anonymouse1 - 05-25-2017, 09:57 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 10:12 PM
Re: Sigh. Mac Pro won't boot. - by C(-)ris - 05-25-2017, 10:51 PM
Re: Sigh. Mac Pro won't boot. - by anonymouse1 - 05-25-2017, 10:59 PM
Re: Sigh. Mac Pro won't boot. - by The Grim Ninja - 05-25-2017, 11:16 PM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-25-2017, 11:47 PM
Re: Sigh. Mac Pro won't boot. - by AllGold - 05-26-2017, 01:43 AM
Re: Sigh. Mac Pro won't boot. - by space-time - 05-26-2017, 02:19 AM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-26-2017, 04:25 AM
Re: Sigh. Mac Pro won't boot. - by space-time - 05-26-2017, 10:50 AM
Re: Sigh. Mac Pro won't boot. - by ka jowct - 05-26-2017, 11:56 AM
Re: Sigh. Mac Pro won't boot. - by bfd - 05-27-2017, 03:27 AM

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