Let me take a moment to thank you for posting on the HP Support Forums.
I understand that you have an HP Officejet Pro 6830 e-All-in-One Printer and vertical lines appear when printing photos. You have cleaned and aligned the printhead already. You've done a remarkable job performing the steps.
To provide an accurate resolution, I need a few more details:
How is the print quality when you print on normal paper?
Please make a copy on the printer by removing the normal paper out and keep only the photo paper.
I recommend you to perform the steps from this link.
NOTE: Please refer to Solution seven>> Step 5: Make sure that the cartridges are properly vented and seated correctly from this link.
I hope this helps. Let me know. Cheers! 🙂
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