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Hi @Habspats,
Welcome to the HP Support Community
I understand you are facing a connectivity issue with your HP Deskjet 3634. Not to worry I will help you to get a resolution to resolve the issue.
To connect the printer back to the new router, we have to Restore the Wi-Fi setup mode on the printer.
- Press and hold the Wireless
and Cancel 
buttons until the Power button flashes, and then wait for the Wireless light to flash. - Once you restore the network to defaults, then please follow the instructions on this link to connect the printer back to your PC.
Hope this helps! Keep me posted.
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