HP LaserJet Pro M401n issue with 10.10.2

Question

LaserJet Pro 400 M401n, purchased 10/23/14 and has worked with 10.10.x, connected by USB to MBP (currently with 10.10.2).
LJ M401n has worked with 10.10.x until 3/26/15, when after completing a print job and immediately attempting another print job, I began seeing an error message “79 Service Error Turn Off Turn On” in the printer display.
When again attempting a print job from my MBP, I see the print job being sent to the printer (blinking green light on the printer) and then after a few seconds, the red error light (on the printer) comes on (displaying the error message) and the printer goes into an auto restart (causing the print job to pause). Once the printer restart completes, the print job remains paused; when resumed, the print job does not complete as another “79 Service Error” message occurs.
The LJ M401n remains correctly shown as my Default Printer in Yosemite Sys Pref Printers & Scanners.
From the HP Utility, I can successfully print a Test page as well as a Configuration Report. (Since I can print these test pages, I believe the USB cable, connecting the printer to my MBP, is Ok.)
Looking at other Settings within the HP Utility, everything looks normal. I’ve even compared a newly printed, Configuration Report to one I printed the day I purchased the printer, and all the details are the same, except the Total Impressions (which appears to be correctly keeping count).
I’ve attempted re-installing the HP Drivers 3.0 (from Apple’s web site), which did not achieve any change from what I’ve described above.
Any ideas as to what’s causing the “79 Service Error Turn Off Turn On” error?
(I've posted this same inquiry at HP's Support Forum; so if I get a resolution reply over there, I'll post here to help others.)

Answer 1

** Kappy, I understand I'm posting about an HP Printer, but this Apple Discussions' section is about OS X Yosemite and printers; and as others may have experienced the same issue, I thought it reasonable to post here seeking a resolution. (Please note I did previously mention I'd also posted at HP's Forum.) ...The printer was purchased at Staples; so, I don't expect much help from them. I think posting in this forum, as well as HP's, might achieve quicker results which others might also benefit.
** pmiles, I have done a "Reset the printing system," but issue subsequently remains. I've even deleted the printer from Printers (before reinstalling the HP Drivers 3.0), and added the LJ M401n back afterwards; no success. Each subsequent time I've gotten the 79 Service Error, I deleted the prior print job before initiating a new one. When the printer goes into the 79 Service Error, the printer does an automatic shutdown and restart. After the printer completes the auto-restart, it again shows in my Printers, but just needs to be Resumed.
However, I can provide more details that could provide further insight about this 79 Service Error issue:
I’ve now found that various, doc types (Text rtf, Pages doc, PNG & JPEG pictures) can be printed. PDFs, via Preview, can also be printed as long as the PDF is not generated from a Safari web page. PDFs saved from Safari (regardless of resulting PDF not being a large file - less than 2MB - and even though the LJ M401n has 128MB of memory) are causing the printer to result in the 79 Service Error. As of this writing, I’ve not tested more than a handful of doc types; but, it appears the printer (or possibly, the HP’s printer drivers) is having issue with Safari’s PDF formatting. (I've posted these additional details at HP Forum.)