That’s a pretty common issue that we generally come across from our clients. The main reason that may lead to HP printer won’t print black problem is an outdated printer driver, printer cartridges are dry or empty, a printer is incompatible to print or it is not connected to the network. To eliminate the issue you must reinstall the printer drivers with the latest version, those are available on the HP support website. Another fix could be replacing the ink cartridges with the original HP ink. Lastly, you must try to connect your printer to the network after restarting the printer and router. If still, you facing an error then feel free to contact the HP tech support guys to get the issue sorted.