Check the grounding of your power oulets. If there is equilizing current trough the ground shield of the interconnecting cable, the information can be transferred with errors. Then the printer cannot process it and gives the 79 error. But HP recommends:
A critical hardware error has occurred.
- Turn the printer off and then on.
- Reseat the firmware DIMM.
- Reseat the formatter.
- Replace the firmware DIMM.
- Replace the formatter.
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