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officejet pro 8500 a910a
Microsoft Windows 7 (64-bit)

I have changed all the ink cartridges in my printer except the magenta, and it still will not print the self test correctly.  How do I test for a bad print head?

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HP Recommended

Error message," cartridge faullty or incompatable witrh printer".  Replaced cartridge with authorized hp cartridge but printer still will not print.  Just repeats error message.     Tried shutting down overnight, unpluged connectors, but still get error msg.  What next? Anybody out there have this pproblem, how did you correct it?

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HP Recommended

Error message," cartridge faullty or incompatable witrh printer".  Replaced cartridge with authorized hp cartridge but printer still will not print.  Just repeats error message.     Tried shutting down overnight, unpluged connectors, but still get error msg.  What next? Anybody out there have this pproblem, how did you correct it?

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