In settings, I don't see a way to stop the PC from going to sleep.
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Go to sys pref -Energy
Slide the Computer and display sliders all the way to the right (to the never position)

If you prefer you can use the build in (by Apple) Terminal command "Caffeinate" to set specific non sleep modes.
Ruskes
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2Unfortunately my Mac doesn't have a computer sleep option. :( – Kay Oct 03 '14 at 19:18
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The used the Terminal and Caffeinate. – Ruskes Oct 03 '14 at 19:55