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Common problems for INSTANT INK, HP+ PLANS: INK AND TONER
We would like to share some of the most frequently asked questions about Instant Ink. Check out this link: HP INSTANT INK, HP+ PLANS: INK AND TONER. .
TerryV147
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OfficeJet 7740 forced me to replace ALL cartridges

HP Recommended
HP OfficePro 7740

I purchased HP printer a few months ago. Black cartridge run out of ink, 3 others showed over 50%. I replaced black one with genuine HP cartridge, however printer forced me to replace all 4 cartridges, one-by-one, saying that they are depleted (which is not the case). 

It is a massing money and eco waste and looks like HP is simply making £££ on us. 

HP - can you explain me why this is happening?

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