IMac screen flashes black and white when returning to top sites or screen saver

iMac screen flash black and white when returning to top sites or before sleep...any ideas why?

Howdy OatsaMae,
It sounds like your screen is flashing unexpectedly on you for some reason. I would recommend this section from the following article to help you get that resolved, named:
Apple computers: Troubleshooting issues with video on internal or external displays
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Thank you for using Apple Support Communities.
Take care,
Sterling

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