Some sources say to perform an ink flush, for me that didn't work because the printer wouldn't do it - it was just stuck in whatever mode it was in. But try that first. If it won't do the ink flush, move on to a basic cleaning, following by one or two cycles of deep cleaning. Try printing after each step and see what happens. Sometimes it starts working again after a basic clean, sometimes it needs one cycle of deep clean, sometimes two. Hope this works for you!
