The bubblejet head uses tiny resistors to produce ink bubbles which are deposited on the paper. the ink openings are in the micro dot range. when an ink resistor fails to fire, no ink will be allowed to flow. I don't know how experienced you are with printers but there is a flat ribbon cable that travels along with the printhead or holder. if this loosens up no signals will get to the printhead. the other end is connected to the driver board inside the printer. could also be a software problem but I can't say for sure.
Have you reset the ink levels for your printer? Some printer software refers to it as that others ask if you have installed a new cartridge.
Do maintenance on the printer, such as clean heads, print test page, head alingment, etc and see if that fixes it. You can get to all these options through properties
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