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iMac displays screen saver when asleep

I have a question.  I was having problems with iTunes, which was fixed by Apple Support yesterday.  Since then, whenever my iMac goes to sleep (set for 15 minutes), instead of the screen going dark, a screen saver of colored lightening-like images appears.   I have to manually put the screen to sleep each time.  I did review system preferences/Energy Saver and have (put hard disks to sleep when possible, wake for network access, enable power nap) and turn display off after checked for 15 minutes checked.  Would like to get my normal dark screen sleep-mode back.  Thank you.

最後更新：2017-09-16 18:44:48

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