My printer is printing pages with text that has white bars through it (basically the bars are where there's no ink). It's just black text. The text doesn't appear to be faded, and the printer software says the black ink has about 1/5th left and it has a green checkmark indicating it's ok. Anyone have any idea what the problem is? It happened all of a sudden. I've been printing fine for the last few days, so it's not like the printer has been inactive for a while and the ink dried up. I tried the self-cleaning option of the software and that doesn't seem to fix the problem. Thanks.