In the registry I searched for Packard and deleted all Keys or entries that had M401 listed. I, nor HP can be held responsible for any mistakes that you make with this step. Have someone with knowledge do this step. If you have no knowledge of how to edit your registry, then PLEASE DO NOT ATTEMPT this. I on the other hand did a couple other steps before hooking the printer back up.ĥ) I installed all of the Windows Updates (critical), updated JavaĦ) Uninstalled the HP printer software for the M401dn and restarted the PCħ) THIS STEP IS NOT FOR THOSE THAT AREN'T FAMILIAR WITH EDITING THE REGISTRY. Continue by selecting the update and download and install.Īfter the firmware installs, at this point you might be able to get the printer to work by hooking the USB cable back up to the printer. Click on your Settings icon, select LaserJet Update, Check for Updates Now. If you're on a home network the IP address will show something like .xx.Ĥ) Once connected to the network you'll run a firmware update. The printer started right up as it should.Ģ) If your printer starts right up, attach an Ethernet cable from the printer to your router/switch/DSL or cable modem.ģ) Select the Network icon on your printer screen and check to see if your printer has authenticated to the network and lists an IP address. If you're STILL getting the 79 error service, then it is most likely a firmware issue. The printer is working now now via these steps that I'm going to list.ġ) Restart the printer with only the power cord being attached. I followed HPs steps on trying to fix this problem and needless to say, their steps weren't worth a hill of beans. I noticed this issue occured when the printer was hooked up to the PC via USB. I ran into this same problem with the LaserJet M401dn.
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