Hello, I have an HP 8600 inkjet printer that recently ran out of ink gave me an error message that car just needed to be replaced. Due to finances I purchased one black 950xl cartridge, changed all the parameters in the print properties to set to print black and turn grayscale on, and now HP is telling me that they cannot find my printer on the network. I have a technical background, so I have reconfigured my Wi-Fi, my router, uninstalled and reinstall printer, ran scan doctor and still HP will not recognize that my printer is connected to the network. I believe HP has a monopoly on the ink cartridges and is intentionally blocking buy block printing as they want me to buy they're colored cartridges. Can you tell me your thoughts on this? Thank you in advance for any assistance. Very frustrated consumer!