My HP Deskjet 3637 prints blurred lines on two out of every three lines. The Third line is nice and clear, but the two in between are blurred every time. One is half blurred, and the second is completely blurred. I have tried cleaning the head, aligning the print, and removing the cartridges and cleaning around the ink nozzles as per the instructions on the HP website, all to no avail. I have run the HP print and scan doctor, and that says everything is fine!
The cartridges are fairly new, and worked fine when first put in.