My 2017 iMac is unable to print! But my old Mac Mini prints just fine! Any insights? Today, something weird is happening: when I try to print (from TextEdit) from my iMac (2017, Retina 4k, running Mojave, printing to a network-connected HP 3055), it ACTS like the document printed, but nothing comes out. I tried cycling power on the printer; no joy. I tried rebooting; no joy. I tried removing and reinstalling the printer; No joy. I tried printing from other applications (Preview, OpenOffice); no joy. From the &quot;HP LaserJet 3055...&quot; application, I CAN'T print a test page, but I CAN reach the printer's web interface, and print a PCL font list from it.
When I copy the document that started this whole mess over to my old Mini (running Mountain Lion, I think), it prints FINE from there. But still no joy printing from my Mini.
Any insights?
HP asked Apple to disable the HP software last Friday and then re-enable it.  You can change the driver to AirPrint and know it you need to apply updates and reinstall your print drivers if that works.
See my answer here for how to manually install a fix if you don’t want to let Apple software updates fix your HP.

HP Easy Scan - &quot;HP Scanner 3&quot; will damage your computer
https://ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essentials-S-5_14_8_4.pkg