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This model printer may only let you use genuine printer cartridges. If you try to refill these ink cartridges it will not work because the cartridges have an embedded chip in the cartridge that detects the empty cartridge even though it has been refilled.
TO clear the error and return the printer to working order you will need to do an ink purge and reset. The problem is caused by air in the ink cartridges. This can happen if you use refilled cartridges or if you let the ink run to low and try to print something. Here is a link to an article that explains what has happened and how to solve the problem. http://www.ccl-la.com/blog/index.php/hp-photosmart-ink-system-failure-1/
Often they have a chip mounted on the cartridge which monitors usage and when it determines that there is no ink remaining, it will disable the printer. Some companies sell compatible cartridges and reset the chip counter. But unless you reset the chip, even tho the cartridge is full of ink, the chip still disables the printer.
HP printers might work and might not work with refilled cartrdiges. You can use it but will create a problem in future and quality of printing will not be good. If still you wish to use refilled cartridge then please tell the name of the printer. If your printer hardware gets damaged because of using refilled cartridges then even if your printer is in warranty hp will not replace it.
The HP 940 cartridge is the new version of the HP 88 cartridge. Both have a chip that estimates ink levels. Once the chip says the cartridge is empty it will refuse to print, no matter how much ink is really left in the cartridge. This is a safety measure so you don't get air in your ink lines. If you get air in an ink line, that color will no longer print. We can refill the HP 88 because there are replacement chips available for these cartridges. I own a Cartridge World ink refilling store and I don't refill the HP 940s yet because I don't have access to a replacement chip. If you purchased a refilled HP 940 and it's not working, I would say the chip has not been replaced. I would wait until a reputable refiller (i.e.-Cartridge World, Office Depot, etc..) offers refills for this cartridge before you try anything off the internet.
This printer takes the HP 940 cartridge. I own a Cartridge World ink refilling store and we cannot refill these cartridges yet. There is a chip on the cartridge that estimates the ink levels and shuts off the cartridge when it thinks it is empty. Any refills you find are either violating patent law with replacement chips or they are telling you to take the chip off your old cartridge and put it on the new one. This second scenario is a rip off because once the chip says the cartridge is empty, no matter how much ink is left, it will refuse to print.
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