Hi, I'm Mima 17. I have an officejet 4620 and am on a usb port. Recently I ran out of in and I bought and installed an HP black cartridge. I did not change the color cartridges (and they are empty). Now my printer will not print from my computer or when I hit copy on the printer itself. Is this because I have empty color cartriges? I don't want to buy them if this is not the problem. Could there be something else going on that I can fix. I already tried cleaning the heads and everything the troubleshoot program asked me to do.