eHow launches Android app: Get the best of eHow on the go.
Summary: The back of HP O2 cartridges have chips that cannot be reset or reprogrammed. Find out why black cartridges cannot be refilled for the HP O2 with help from an employee of an ink-filling station in this free video on HP printer cartridges.
"Hi, this is Taylor. Today we're discussing HP printers and how to refill a cartridges. Our subject today is the HP O2 cartridge. The HP cartridges are quite interesting. On the back, they have little chips that can not be reset or reprogrammed. So, the unfortunate new is the black cartridges will not be accepted back into the system, so they can not be refilled. However, the color cartridges may be refilled and you can get around the system. To refill the HP O2 color cartridges, simply get a finger drill, or a shop object and puncture in at the top. Once you have a opening, you can get a syringe filled with ink, insert and put in about ten milliliters of ink. Once that is complete, simply get a hot glue gun and glue the top. In order to get HP O2 cartridges to work again, you must turn your printer off before reinstalling. Turn it off, turn it on, insert the cartridges. You will then be prompted with two warning signs, both of which just say "I ignore." Then, when you go into your printing preferences, disable your ink status monitor. Once it's disabled, you will be able to print."
eHow Article: How to Refill Printer Cartridges on the HP O2