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Common problems for Connectivity Issues
We would like to share some of the most frequently asked questions about Printer Wi-Fi, Connectivity Issues and Offline Status. Check out this link: HP printer is offline or unavailable.
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HP LaserJet Pro M404dn

We have an HP LaserJet Pro M404dn printer that has gone offline, I've replaced the network cable and plugged it into a different network port but it's still not working. It appears the Ethernet connection on the back of the printer is no longer lighting up. I can't reset the printer as all those menu options have been disabled.

I can connect to it with a USB cable but I don't know how to reset it or change any other setting that way.

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