ChatterBank3 mins ago
Printer cartridge won't work
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How can I get my HP940C to take a HP51645a black cartridge?
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For more on marking an answer as the "Best Answer", please visit our FAQ.I use a HP T45 printer at work and sometimes have problems getting it to recognise a new cartridge (uses the same as yours) when it has been installed. I have found the best bet ,especially if your using re-filled cartridges, is before inserting the cartridge clean the gold contact strip with contact cleaner and then give it a try. It may take a couple of goes but it usually works.