Printer installation for HP LaserPro 400 won't install on Mac OS X 10.7.4 Lion.
closed as not a real question by daviesgeek, jmlumpkin, bmike♦ Sep 9 '12 at 18:43
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
HP have released updated drivers (and associated software) since the initial release of 10.7
The following link is to the HP LaserJet Pro Series Full Solution Software and Driver package on the HP support website.
This should resolve your issues. If not, please provide more information on the issue you are having.