My screen (about 5 years old) just went faint, dull grey.  Any ideas how to reverse this?

After using my iMac daily for a few years without any problems, the screen suddenly has gone to a dull grey, with low contrast.  Any ideas why this would happen and how I can restore it to its earlier brilliance?

At 5 years old it could be failing or wearing out, but just to check - did you try to turn up brightness and turn off auto dimming in System Prefs -> Display?

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