Q: I'm using HP deskjet F300 All of my attempts to refill the black ink cartridge worked. Its done by injecting ink into the cartridge. But each time i try to refill the color ink cartridge, it couldn't work. Still no ink comes out of it. Any idea whats the problem here? thanks alot
A: Because it's not compatible with HP deskjet F300. I had the same problem and just had to buy new cartridge. Have a great day!