I Have an HP DeskJet 500 printer. The ink cartridge will die right at 50% of it's lifespan, as though the ink head just dried up.
I know how to prime the cartridge, and I know how to perform a printhead cleaning, in fact I will do it regularly. It is not that the head is drying out, or that it is becoming clogged or from lack of use, I use the printer all the time. It's just the printer will quit printing as soon as the cartridge gets to 50% use.
I Put in a new cartridge, and it will work great, down to 50%.
After 50%, the heads look fine, and the cartridge is only 1mo old. I do not used refilled cartridges.