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HP OfficeJet Pro 9012e All-in-One Printer

Hello 

I changed the cartridges and now the printer is stuck in a loop. Turn it off and on again, unplug the power cable... Nothing of this has helped. Current display: "Validation in progress... Please wait." This message has been on the display for hours now.

Can someone help me??
Thanks for your notes.

 
 
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