HP Diagnostic Utilities
The latest release of the HP Print Diagnostic Utility can always be easily found using this link: http://www.hp.com/go/tools
Information and links to other HP Diagnostic Utilities that are useful for troubleshooting network and scan issues can also be found at the above link.
MODERATOR: Please consider making this post sticky...
Although I am employed by HP, my comments and opinions are my own and not those of my employer.