The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. between the years of 2006 and 2013.

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Video fans stop,video stops: computer stays on.

I have 2008,A1186 EMC 2180 3,1 Mac Pro 12 gb ram running OSX 10.9.5.

The unit ran great for several months using two 27" monitors; the video started shutting down gradually until it stopped altogether. I replaced the original ATI 2600 with an NVIDEA gtx 8800 GT. Nada at first; so I installed in slot 2; that worked, but I could only run one monitor. Two monitors would stop the fans and thus the video.

When I switch back to the single monitor, the unit will shut down the same unless I leave it alone for a few days.

After that, it will stay on for hours, sleep, shut down ,reboot, and act normal.

I bought this Mac to run Ableton and other DAWS, but because it has become so unreliable, I'm using a late '12 mac mini, which is good, but can't touch the '08 Pro on speed and quality.

Can you kindly assist me; I have upgraded both my '09 mini and the '12 mini; though I'm aware of the complexity of what I may encounter, I am confident that I can tackle it.

Where do I start?

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Info mistake: The new video card is an nVidea GeForce GTX 460.

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After a great deal of thought and applying the old advice of "it's probably something simple", I applied Mayer's response to a similar problem and divided the ram placement to both trays. The video card problem ceased.

I am glad to have found this site for the great advice and assisting me in kick starting my thought processes.

I won't hesitate to return.

Regards,

Ed Fiala

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Ed Fiala will be eternally grateful.
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