The most obvious reason to get your printer unresponsive is the faulty ink cartridges. So before you do try for anything, first check if any of the ink cartridges, especially the color ones are dried out or the faulty. However, if you still face the issue of the HP printer not printing in colour, make sure the drivers installed on your system are up-to-date.

Also Read:
How to Connect HP Printer to Mac Wireless
HP Printer Assistant Install
HP Printer Error b8047a26
Canon Support Code b200
Support Code 5200 Canon