Twenty inch Imac display does not shut off in Yosemity.

               I am blind, My Mother who can see informs me that the background has been on for days.    

Hello James,
Display sleep and computer sleep can be adjusted in System Preferences -> Energy Saver. It may be that Display sleep is set for Never, which will keep the screen on as long as the computer is on.
OS X Yosemite: Set sleep and wake times for your Mac
http://support.apple.com/kb/PH18582
Cheers,
Allen

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