In 30+ years I've yet to encounter a problem on a PC that I can't solve but this one is driving me insane and I can't waste any more time on it. The problem is simple; all my printers are missing colours when printing from one particular PC. If I attach any of the printers to another PC everything is as it should be. If I attach any of the printers to this one particular PC it appear not to use the black or magenta cartridge regardless of what application I use to print. I've tried printing using WiFi and a direct connection. I've tried deleting and reinstalling all of the printer drivers. I've even tried printing with nothing but a generic Windows 10 driver. I imagine a total reinstall of Windows 10 will fix the issue but that's not going to happen. Any ideas?