Please can you confirm the Make Model and OS, along with any configuration details like touch screen, backlit keyboard, SFF or tower etc etc.

I assume it is not a monochrome device?

Make sure the print settings are not "gray scale" or "black ink only." if the print settings appear to be correct the color cartridge could be out of color ink or it could be clogged.

If your printer is not printing in color:

• Check that Color Printing is enabled in printer settings.
• Make sure color ink/toner is not empty.
• Run a printhead/nozzle cleaning.
• Print a test page.
• Update or reinstall the printer driver.

Let me know if these works

First, check carefully if anything is stuck inside the printer's colour cartridge area.
Also, which version of the printer is it?
If your version is C1760NW, / Then run Auto Colour Registration.