Hello cklan.
I understand you are unable to print a "alignment page" from your Photosmart C4795. Please follow this entire HP document on Troubleshooting Print-Quality Issues.
*Note in this document there are numerous levels of cleaning the printhead to improve your print quality*
I am going to provide a HP document on An 'Alignment page not detected' or 'Alignment failed'.
Please inform me your troubleshooting steps and if these steps resolved your issue.
Looking forward to hear from you.