HP LaserJet 4100 "Processing"
Doing a little reading online I read it might be your Firmware module, Ram, Jet Direct Card, or Fuser. So I do some swapping of all of those with our spare printer. I even swapped toner for the hell of it. NO difference.
Next I try the backup printer, put the jet direct card of Printer C into the Backup and I get 9 pages before the same thing happens. I can print the same report to Printer A which has a newer Jet Direct card and More ram, and a Duplexer and it's fine.
Last thing I am going to try here when people go home is to Take the Firmware Module, Ram, and Jet Direct card out of Printer A and put it into Printer C and see what happens. I somewhat expect it still not to work.