Should I connect the network cable before powering on the printer for the first time?
No, you must not connect the network cable at the initial startup stage. Connect the power cable to the printer and wall outlet first, then power on the printer using its power switch.
From the official HP Laserjet Mfp M72625 M72630 manual, page 6
Have a follow-up question?
Answers from the official manual.
Common questions