I thought that I was using the latest HP driver.
System Preferences says Driver Version 4.2.4 ??
I have now downloaded what HP says is Driver V. 12.34
After download and install, Sys Prefs still says V. 4.2.4 ??
The printer now prints but ... type sizes are in different
shades of blue. There is no black where there should
be black! There is some progress, as it is no longer
printing blank pages. Switching printers to my HP psc
1315, produces a true black and colour copy of the
original.