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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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How to fix a screen that goes blank/sleep after a few minutes

The computer works greats at startup then after a few minutes, less than 5 min, screen goes blank. Mac doesn't shuts down, it keeps running because lights are on, can hear hdd or see and access computer on home network but screen doesn't show anything. It just shuts down. It's not the monitor because it works/stays on other computer. I also have Windows on bootcamp and there, the monitor stays on all the time so i can't figure out why under MacOS it doesn't stay on. Any help? Thank you

MacPro : 1.1 (early 2008)

OS : Yosemite

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it usually means it is set to do that. go to System Preferences > Energy Saver > set your desired values. That should make it work.

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7 Comments:

it says "Could not load Energy Saver preference pane" :-/

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After a trick with putting the app on 32-bit mode from Get Info, i was able to see the Energy Saver and it was on "Never". Still got the issue. Screen then went blank.

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it's weird that the preference pane didn't load at first but does it have a PCI graphics card?

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Yes it does. ATI Radeon HD 2600 XT 256MB

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Sorry for this very late info, I did a lot of research. If it has an onboard display output, could you try removing the GPU and using the onboard graphics? Maybe the card or port is bad.

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Khalel Leconte will be eternally grateful.
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