My screen is now a black and white negative image - can I reverse it to col

After 3 small children were near my computer - it was turned on , the screen is now black and white like a negative image, when starting up the initial checks of firewall etc are displayed on the normal colour screen then as soon as the start up is over it goes to Black and white. I have been through the settings on the computer but can not find any changes that have occured - I suspect the 3 toddlers have pressed everything at once
Can anyone tell me how I can get the colour back?

Open the Universal Access pane of System Preferences
and turn off the White on Black option under Seeing,
as well as any other options which may have been
inadvertently turned on or changed, such as the
contrast.
(12735)
Thank you very much - problem solved in 10 seconds flat
Peter

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My screen is now a black and white negative image - can I reverse it to col

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