After black ink cartridge installation Hp 6978 printer will not print or scan


I just installed a new 902XL black ink cartridge and now it will not print anything?? A yellow exclamation mark shows up very quicly and says the scan to the computer is not connected or reading My color inks are low but still vital. I have tried taking them all out and starting over but it would not totally print a allignment page…all the color did not print so the printer could not read it when i tried to allign. I have turned everything off, refresh and still it will not print from computer OR scan Hp office jet pro 6978

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