There are multiple causes to this problem. First, you need to check the ink level of the printer. If the HP tool reports it with problems, you will need to either refill the cartridges or replace them. Secondly, please check if the printer does not have any fade-out printing effects. You can do this by tweaking the settings from the HP support applications. Best way is to set them to default. Also, try to print a test page and check the errors. If the paper is printed correctly, then the printer has some settings configured, but if the issue applies to the test page then there must be something wrong with the printer.