Just replaced my printhead in my Stylus Pro 9900 and when I turned it back on, it started giving me “Ink Cartridge Error, Replace Ink Cartridge” flashing on all 11 inks. When I take any one ink color out and close the door, all the ink levels read correctly and it shows the one ink cartridge missing. But when I return that ink cartridge and close the door it starts flashing again. I’ve tried things like taking out the maintenance tank and cartridges turning of the printer and unplugging it and letting it sit, then restarting it. But none of this works. I hope someone out there has a solution.