I have this printer and have had exactly this problem. In my case, it seems that the print head is not sitting correctly. I solved the problem by removing the cartridges, then the print head and replacing the print head, then the cartridges very carefully and gently. You may need to do this a couple of times. There are instructions for removing the print head on the web, but if you get stuck, come back and I will reprint them here. Good luck! John W
I had the same issue with my Apple wireless keyboard. I had two keys not working. Tried all sorts but nothing worked, so I put it back in its box. Three months later I took it out, put new batteries in and it’s worked perfectly ever since. I’m writing this message on it now. Worth a try when all else fails!