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Microsoft Windows 7 (32-bit)

I previously had ATT internet and changed to ATT fiber optics a few months ago. My computer, printer, and TV's continued to operate on the old Network and security code until my husband reset the router and it did a factory reset to the new network name with a new security code. All TV's and computers work on the new network name but I cannot get my wireless printer to work anymore HP Officejet Pro 6978 and there is no support since it is out of warranty. It was fine before the reset. I have redownloaded the drivers, it shows new network and I entered new security code on the display of the printer and I cannot get it to work now. Please advise.

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