PC Load Letter. The “Check Engine” light of the HP LaserJet II, III, and IV models. This message was supposed to mean Paper Cassette Load Letter and indicate that there was no letter sized paper in the Paper Cassette. What it actually meant was both everything and nothing. It could’ve meant that the manual paper tray was open, empty, had the wrong paper, or like all electronics, needed to be rebooted.
This “error message” became very popular in the movie Office Space. Office S... read more.