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macrumors 6502a
Original poster
Apr 14, 2010
829
258
My 5,1 Mac Pro 6-core, 5870, 12GB Ram will no longer power on. Started when the system failed to wake from sleep today and had to be forcibly shut down. Now even after disconnecting the power cable for several minutes, it will only make a click noise when attempting to power on.

Tried Mac Pro SMC reset (remove power cable for 15sec, plug in, wait 5sec, press power).

When I remove the 3x 4GB RAM sticks it will power on, but does nothing. I've tried all RAM slots and the only one that appears to allow a RAM stick in with power turning on is slot 4 of 4.

However, even though the power turns on, it does not reach the Mac chime (POST). I try holding PRAM reset buttons, but it obviously isn't even making it that far.

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Anyone have any idea what part of this Mac Pro has died? I'm guessing not the PSU since it will power on with no RAM.
 

IowaLynn

macrumors 68020
Feb 22, 2015
2,145
589
SMC reset (remove power cable for 15sec, plug in, wait 5sec, press power).

Hit power button for 10 seconds while unplugged, otherwise it really does not reset SMC.
 

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macrumors 6502a
Original poster
Apr 14, 2010
829
258
Why the "thanks Yosemite" in the thread title?
Do you really think this was caused by Yosemite?
Not likely IMO

The failure to sleep started after updating from 10.9.x to 10.10.3. Nothing about my habits or software changed. I held out hoping 10.10.4 would fix the bug, but that brought nothing. So yes I can safely say Yosemite is at fault. Apple must stop passing off beta software on the public as supposed stable product.
 

monokakata

macrumors 68020
May 8, 2008
2,063
605
Ithaca, NY
My 5,1 wouldn't start. I tried all the usual fixes, but nothing worked. I never considered that the video card might be bad, but when I removed it the machine chimed and started up properly so far as I could tell. I had an old card and so I installed that, rebooted, and all was well (except for having lost $ on a new card and having to use an old 3870).

Try removing your video card, just to see. As I said, I'd never have suspected that mine was the problem.
 

MacDawg

Moderator emeritus
Mar 20, 2004
19,823
4,504
"Between the Hedges"
A quick search shows that YOU have experienced issues with Yosemite when it hosed your Bluetooth devices. Bugs will occur, but when they contribute to hardware failure it's more than a little frustrating.

Yes, when Yosemite first came out, some of my Bluetooth devices wouldn't connect, which was remedied fairly quickly with no further issues.

Your OP did not mention anything about your upgrade from 10.9 to 10.10 and the timing of your issue, only your title mentioned Yosemite, which is why I asked.

Your OP also did not mention a failure to sleep, but rather a failure to wake from sleep. Which is it? I am genuinely confused now.
Also, if the machine will not power on, how did you upgrade from 10.3 to 10.4 to see if would resolve the issue? More confusion.
There seems to be more at play here than what was stated in your OP, so it may be hard for people to offer advice without the full story.
 

ZZ Bottom

macrumors 6502a
Original poster
Apr 14, 2010
829
258
Your OP also did not mention a failure to sleep, but rather a failure to wake from sleep. Which is it? I am genuinely confused now.
Also, if the machine will not power on, how did you upgrade from 10.3 to 10.4 to see if would resolve the issue? More confusion.
There seems to be more at play here than what was stated in your OP, so it may be hard for people to offer advice without the full story.

Failure to wake from sleep.

The machine had to be forcibly shut down when it failed to wake from sleep, which was about a 50/50 occurrence. For the most part I left it to never sleep, but occasionally it would get to me wasting so much energy while I'm away, so I'd attempt letting it sleep. I use it as a media server with two Apple TVs accessing content about every other day.

I updated to 10.10.3 about two weeks prior to 10.10.4 releasing.
 
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