Windows 10: Can't print in colour to any printer from any app

Weird issue, I cannot print in colour at all any more.
I have tried different printers and printing from different apps, all with the same result, i.e. colour prints in grayscale.
I have looked at 'manage your device', 'printer properties' and 'printing preferences' and cannot see what the problem is.
It must be something obvious!
Any help appreciated. (I'm on HP Instant Ink, and every time I test, it goes against my monthly allowance!)

:)

 

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My printer ( Dell p513w) will not print in colour

Hi, Thanks for your help, your instructions were clear and concise.

I ran through it all and did as you suggested and while this has greatly improved the overall print quality and the printer now correctly reads ink levels, I still cannot print in colour.

Have you any further suggestions ?

 

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