Probably you've already tried the steps at about pages 79 and 90 in the
manual . Try also cleaning off the nubs that touch the contacts on the cartridge. They might have some ink vapor coating them. If none of this helps, the printhead is clogged or defective. Sometimes a
printhead cleaner will help. You can try taking all the cartridges out, turning off the printer, let it sit for a couple minutes, reinstalling the cartridges, and turning back on. This is more like voodoo magic, but once in a while it works.If not, then you pretty much have to kiss off the printer since the printhead is not replaceable.