Help. I have a HP Officejet 6100 printer. It has worked great up to now. Every time I try to print I get a message that says the printhead appears to be missing, not detected, incorrectly installed or incompatible. I installed all new cartridges. That didn't work. The cartridge lights are blinking. I entered my serial and product numbers and it says my warranty has expired. Any ideas on what I can do?
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