Hello hrblockjill,
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I saw your post about your Photosmart 6510 not printing in black ink and showing an Alignment Failed. I have researched the problem for you and have found a guide for you to try. I really hope this helps.
An 'Alignment failed' Error Message Displays on the Printer
If the troubleshooting does not help resolve your issue, I would then suggest calling HP's Technical Support to see about further options for you. If you are calling within North America, the number is 1-800-474-6836 and for all other regions:click here.
All the best,