I own a very nice and very good HP Deskjet 6250. in 2005 I bought a stock of HP ink Cartridges that were on sale. At the beginning of this year my existing color cartridge finally ran out. I opened up the packet of my new full cartridge, inserted into the printer and the printer refused it. I tried everything to get it to work, but finally spoke to the online help message service. Now in all fairness to HP the guy on the service desk -Calvin, was fantastic. He really helped and knew exactly what the problem was. ALL HP cartridges have an expiry date programmed into them, and all HP printers have a battery and a "clock" which stores the date. When the cartridge is past its expiry (despite being full) it will not be accepted and you cannot use it. This is a shocking practice - and the only point of it as far as I can see is that it brings in more money for HP. It really should be stopped. I now have two new full cartridges which can never be used, unless I disable the battery in my printer - which I am very tempted to do.
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