HP LaserJet pro color MFP M276N Network lan port no working
Troubleshoot the wired network connection
Make sure you are using an undamaged Ethernet cable, check for a green light near the Ethernet port on the printer, and then print a report to verify the connection.
Turn off the printer, and then disconnect the Ethernet cable from the router and the printer.
Check the cable for damage, and then verify that it is an Ethernet cable and not a phone cable.
NOTE: Ethernet and phone cables look similar, but Ethernet cables are usually bigger and have eight visible wires on the connector.
Reconnect the cable to a different Ethernet or LAN port on the router, and then connect the other end to the printer's Ethernet port.
Turn on the printer.
Check the lights on the printer's Ethernet port to make sure the connection is successful. The green light should be steady, and the orange activity light should blink.
Print a Wireless Network Test Results or Network Configuration report.
Inkjet printers with a control panel menu: Open the Wireless, Network Settings, or Setup menu to locate the list of available reports.
Most inkjet printers without a control panel menu: Press the Wireless and Information buttons at the same time, or press the Wireless and Start Copy Black buttons at the same time.
LaserJet printers: Press and hold the Wireless button for 10 seconds or until the Ready light blinks, or go to the Wireless menu and select Wireless Network Test.
Laser NS and Neverstop Laser printers: Press and hold the Resume and Wireless buttons for 3 seconds.
DeskJet 6000 and 6400, ENVY 6000 and 6400, and Tango printers: Touch and hold the Information button until all control panel buttons light up, and then touch the Information and Resume buttons at the same time.
Make sure the Network Status is Ready, or follow any instructions to resolve network issues identified on the report.