How to Change an Apple Computer's Background to Black and White

Find the 'Apple Menu' icon. This is located at the top left corner of your screen.
Select the 'System Preferences' menu.
Click on the 'Universal Access' icon. It's on the last row to the far right.
Choose the 'Keyboard Shortcuts' menu.
Press the 'Switch to White on Black' push button.
Push the button again to return screen to black on white.
Adjust the contrast by moving the 'Enhance Contrast' button between 'Normal' and 'Maximum.'
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