Documents are printed in monochrome
Is Color Mode set to Monochrome, or Print Target set to Monochrome (Photo) in a
Windows printer driver?
In the Advanced Settings of the printer driver, specify Color in Color Mode and try printing again.
Is Black and White Photo Print selected in a Mac OS printer driver?
Deselect Black and White Photo Print in the printer driver Quality & Media settings, and then print again.
The print head nozzle may be blocked
Print a test pattern to check the color ink nozzles and see if they are clogged.
Checking for Nozzle Clogging