I posted the following on the HP support site.

"My hp4620 printer would only print black on one half of the line. This progressed to no print in black. I changed the cartridge and followed all of the support recommendations including updating the firmware.

By chance, I found that ink is indeed leaving the cartridge. It is puddling on the bottom of the printer.

Any suggestions for this just out of warranty printer?

Thanks Much,"

Whatdaya think?

Don S.