This article explains the common issue of a printer only printing in yellow and blue. It explains that the issue is typically caused by the printer being set to only print in those two colors. It lists the steps to follow to change the printer setting to allow it to print in other colors. It also suggests that it could be an issue with the printer cartridge, which can be fixed by cleaning the cartridge or replacing it. Finally, it provides a link to a troubleshooting guide with further information. In summary, this article explains why a printer might only be printing in yellow and blue, and provides steps to fix the issue.