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The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Mac Pro won't wake up from sleep with Mountain Lion

Hi! My Mac Pro 2.8GHZ 8-Core Early 2008 won't wake up from sleep mode now that it has Mountain Lion. I have found it asleep a few times now, and pressing the power button doesn't wake it up. When I manually put it into sleep mode, it has the same problem.

I've set Energy Saver to never go to sleep, and that seems to work, but it would be nice to not have to do that. A friend's identical Mac Pro with Mountain Lion is not having this problem.

Any ideas?

Thanks

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UPDATE: My friend's Mac Pro actually ISN'T waking up from sleep mode either! So this does not seem to be a problem specific to my machine.

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My Mac Pro has the same trouble - never able to wake up again!

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Hello, my early 2008 mac pro is also suffering the same problem, it comes out of sleep briefly then goes back into sleep and can't wake it so have to reboot. Annoying to say the least.

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My 2008 Mac Pro is having the same issue 10.8.1. Won't wake from sleep. Sometime I can wake it by plugging or unplugging USB and FireWire drives. Sometimes it just shuts down and I loose everything. BAD.

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All the answers here is for when you manage to wake the Mac up, mines fallen asleep and I can not wake it up - can someone help me with this? I have tried everything from just pushing the button ones, turn off+unplug+wait+plugin+start, key press to reboot...

Any other ideas?

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Seems you have discovered an undocumented feature aka bug. Many users are having sleep issues with the Mountain Kitty. Some can't get it to nap, others have a variety of issues waking or after waking. This seems to be a software, not a true DIY repair issue.

Update

Apple has issued an SMC update for the Retina MBP which has fixed the issue for them. You should run Software Update and see if there's one for you, too.

If this answer is acceptable please remember to return and mark it.

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Good to hear I'm not alone. Hopefully 10.8.1 will address this.

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I found the simple fix! my Mac Pro is from mid 2008. After I recently installed Mountain Lion when it goes to sleep it often won't wake up. I would have to force shutdown and restart. I didn't find any satisfactory solutions online. What I discovered though was to go to System Preferences, then Energy Saver and click off all checked boxes. My computer wakes up every time now. Problem solved. That easy!!!

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This has been my temporary solution as well. Hopefully a real fix will come along soon.

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Soluton posted by jru, it fixed my MacPro (10.8.1) problem after unchecking from engery saver

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I'm having a sleep issue myself on my late 2008 Mac Pro. It just goes to sleep suddenly and I'm not able to wake it again. I have to force shut down and restart it again. But after a short while it just decides to go to sleep. I'm running the latest version of Mountain Lion 10.8.1

I ran the maintenance software Cocktail on it, but it hasn't helped my Mac Pro.

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I'm wondering if it's a planned obsolescence program... seems to be happening really often with these machines now. Two of mine just went down recently to this problem.

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rdklinc zal eeuwig dankbaar zijn.
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