When you refill these cartridges by HP, or if you buy remanufactured cartridges that do not have new chips installed, you can overide the chip monitoring so the printer can allow you to print.  Here is how to do it:
 

1.On the printer control panel touch (right arrow), and then touch (Setup).

2.Select (Preferences), and then select (Cartridge Chip Information).

3.Touch (OK) to turn off usage information collection.