Help! My screen saver stopped working?

2013 iMac
3.1 GHz i7
16 GB DDR3
OS X 10.9.3 (13D65)
My screen saver stopped working about a month ago. I tried resetting the PRAM and it worked for a few minutes, but then it stopped. I tried using Hot Corners, but it starts and then turns off after a few minutes. I am able to make it work if I turn Airport OFF and disconnect the computer from the internet.
What are my recommended next steps to get the screen saver back to normal function?
Thanks for any and all help.
Joe in NY

This worked for me . . .
ds store At the center of the Dark Zone
Re: my screen saver on my new mac book pro stopped working. I have rebooted, changed screen saver mode it still does not work
Oct 9, 2012 12:45 PM (in response to cogma)
We are going to delete a hidden file.
Finder > Go Menu > Go to Folder and type or paste
~/Library/Preferences
and scroll down until you see
com.apple.systempreferences.plist
drag the one you can (may see two) to the Trash, reboot, reset your System Preferences again.

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