We have had this Dell 2150cn in the office for a little over a year, and all-of-the-sudden this morning it prints line after line in alternating fashion down the page in all colors, including black.  On black only pages it only prints black lines.  The black and white image below was made by going through the menu on the machine itself, cutting out the driver or network. I went into the Admin ... maintenance section for the machine and reset it to default, but nothing changed.  None of the cartridges have been changed in the last five days.  It printed out fine yesterday evening.  Below are three images of pages printed out by this machine.  I thank you in advance for your time and your replies, and I hope that someone can figure this out.