HP printer

my HP 940c thinks it needs ink even after a new cartridge. but not all the time, i just printed 4 pages and now it tells me no ink, this is off and on
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  1. Did you replace the black and the color, or just one of them? If you only replaced one, the other may need replaced as well.
  2. That's a hardware fault. Get it serviced.
  3. I replaced both cartridges, decided to trash it and just buy a new printer!
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