When you insert cartridges into the HP Officejet Pro 8620, push them into place and they should pop out a fraction of an inch. One of the rounds didn't recoil, but a slight tug was enough to set the round into position. The brochure does not say what to do about it. The printer screen and later in the printer utility on my computer showed the usual warnings about non-genuine HP inks. The printer printed out several different test sheets without complaint, but when I tried to print the document from the computer, nothing happened even though the print job appeared in the queue. Turning the printer off and on resolved the issue. This company seems to genuinely care that the customer has a positive experience. I will use your ink again. Update: After several months of normal operation, my printer suddenly stopped working. I considered throwing it away but checked the utility which said one of the cartridges was defective and something near the electrical connector was swollen like it had overheated. I ran to the store to get a genuine HP cartridge and after thoroughly cleaning the print head with 91% isopropyl alcohol everything was fine for a while then streaks of a different color started to appear so I replaced those all ink by real ink.
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