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My printer is an  Officejet Pro 8620.  My connection is wireless.  Initially, I installed cartridges purchased online only to discover they were NOT genuine. 
I then purchased genuine HP 950xl/951 from my local Office Depot. 
SKU: 8 87111 63511 2; expiration OCT 2024
All 4 cartridges installed properly, all brand new, never used. The printer error message: “One or more cartridges appear to be damaged.  Remove them and replace with new cartridges”. 
To begin with, all 4 cartridges triggered this message; I’ve removed and reinstalled numerous times, now the 2 cartridges identified are the Cyan & Black. 
It doesn’t matter if I plug direct to wall socket or surge protector. 
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