HP photo smart C4780 blurred black cartridge printing

[Rossdocamb]

please help, recently the print quality of the black cartridge is very blurred/shadowed. There are double lines when printing tables etc.
I have tried cleaning the nozel heads with the hp tool and manually wiping the cartridge. I’ve tried aligning the cartridge, I’ve tried changing  to a new cartridge (all genuine Hp cartridges). I’ve tried printing from another computer, and nothing has resolved it. I have to stress it’s only in the black cartridge that it’s happening to and only recently, since I changed to a new cartridge. 

anyone have any ideas how to resolve? Is it possible the the printer nozel is defective, and if so how would I get it fixed. It seems there are not too many new, all in one, black hp printers available these days. 
Many  thanks in advance. 

[Echo_Lake]

@Rossdocamb

Thank you for posting on the HP Support Community.

Don't worry as I'll be glad to help, 

Since you have already tried most of the troubleshooting steps to resolve the issue  I would request you to contact our Support and our Support Engineers should be able to sort this out. HP Support can be reached by clicking on the following link: www.hp.com/contacthp/

And, also you can refer to the : https://support.hp.com/in-en/document/c04326460 Printer Prints a Blank Page or Does Not Print Black or Color Ink for the HP Photosmart e-All-in-One.

Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

[Rossdocamb]

I tried the online virtual agent, which didn’t get me anywhere. Do I need to pay to call you? 

[Echo_Lake]

@Rossdocamb

Thank you for posting back. 

If warranty is expired then you might need to go for out warranty service options.

Click here: https://www8.hp.com/us/en/contact-hp/ww-contact-us.html to contact HP Worldwide and select your region.

Keep me posted!

[jdre1]

Purchase old ink on Ebay from 2018 not made in Malaysia.  Install, align, enjoy.  I have gone through this.    Others have had this problem.  I believe the 60 and similar 901 cartridges are badly aligned.  See https://h30434.www3.hp.com/t5/Inkjet-Printing/Ink-not-aligning-for-smaller-text/m-p/7774088#M889875.