Why does my screen go black while I am working?

  • Starting out of the blue a couple of days ago, my relatively new Macbook Pro (running Yosemite) started randomly putting itself to "sleep" while I am working. What I mean by "sleep" is that the screen goes black, it pauses iTunes, and it signs off of any Skype calls that might be in progress. I am mystified about how to fix this.
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You selected one of the oldest MacBook Pro's! - Intro'd May 2006 Discontinued October 2006

Can you clarify what you have for a system. Plug in your systems S/N here EveryMac - Lookup once you know let us know!

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