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HP DesignJet 800 Missing Cartridge

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Designjet 800ps
Microsoft Windows 10 (64-bit)

I have a Designjet 800 that is flashing a black Ink cartridge missing and Magenta

Incorrect Ink cartridge installed . I've replaced the black ink cartridge,  Ink supply station, interconnect card and main board and flashed the firmware. i still get the same errors. Any ideas as to where to look next?
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have you replaced interconnecting cables on this printer?

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