Display settings mac mini

Hi, i have a real beginners question. It seems my two year old daughter had some fun with the setting of my mac mini. Now the display has no red colors. Everything is fine during an application update or reboot. Any ideas? Thanks!

One thought: Try starting the the Mini with NO monitor connected, then plug in your usual monitor. That may cause it do go to a default monitor setting which will be viewable. If so, then go to the monitors control panel and set it the way you want.
-- Eric

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