We changed our internet service from comcast to xfinity. I have not been able to get the printer online for use from any computer in the house.
on set up of the computer it says its on line but the computers say its offline . What do I need to do to fix this.
A search for the printer's brand and model number like https://www.google.com/search?q=hp+printer+network+setup should find pages that help. If you can't get it working please post the printer model number and how it is connected (Ethernet? Wifi? USB? ???).
Ex: https://support.hp.com/us-en/document/c05987925, "HP Printers - No Connection after Router or Wi-Fi Settings Change".