Prints come out with a colour cast, wrong shades, or a missing colour. On inkjets this usually means a clogged or empty colour; on lasers, a calibration or cartridge issue.
Work through these in order; most people are fixed by the first two or three.
Print a nozzle check; if a colour block is broken, run a head cleaning and re-test. A missing colour is usually a clog or empty tank.
Use the printer's colour calibration/registration routine (laser) or alignment (inkjet) to correct casts.
Make sure you're not in grayscale, set the correct paper type, and use the right colour profile for photos.
Replace any empty or failing colour. For lasers, reseat toners and confirm none are low.
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