LASERJET PRO 400 COLOR M451 printer series Produce professional-quality color documents with ease and fast speed. Seamlessly integrate into your office or wireless home network.
LASERJET PRO 400 MFP M425dn A Web-connected MFP for office productivity. Print from virtually anywhere, using HP ePrint2, and share resources with Ethernet networking.
HP suggested the way to clear the RAM is to power off, hold the right arrow and X together, then turn on. When display reads 'permanent storage', release keys. Client did this, printed the bad partial pdf again, and for the moment appears to be OK.