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HP DeskJet Plus 4155 All-in-One Printer

I must be missing something.  My router was just replaced with the latest modem, which changed my network's password.  Now I am unable to connect my HP Deskjet Plus 4100 All-in-One Printer to the internet.  Any ideas?  I last did this 4 years ago and I just don't remember what I did.

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