You are wondering, 'what is a printer error 79?'. This is a common problem among many HP LaserJet printers, such as the CP2025, usually caused by a bad print job. Despite the prompts on the printer screen, turning the printer off and on does nothing, and in fact, the printer may restart itself over and over again. ![](https://hackmd.io/_uploads/r1A_UW3un.jpg) Don't worry, many of our customers have asked us for advice on how to fix this annoying problem, so we'll show you what to do in 4 easy steps... * Laserjet Pro customers may see the HP 79 service error on the printer control panel. There are two types of this error. * The first is Error 79. This is caused by outdated software drivers or firmware. * 79 Service Error is the second. Occurs when an incompatible DIMM is installed. * Follow the two main methods below to resolve this issue quickly and easily. **Solution-I 79 Error Turn off then on** * Turn off your printer, wait 30 seconds, then turn it back on and wait for it to initialize. * Remove the extension plate if you are using one. Plug the printer into the power outlet immediately and turn it on. * If the error warning persists. Disconnect all network or USB cables after that. * Check the firmware version of your printer and, if necessary, update it to a newer one. NOTE: You can check your printer's firmware version by printing the configuration report from the control panel. If the problem persists, you should delete all print jobs from all computers that are linked to the printer. **Solution-II 79 Service error Power off then power on** * Turn off your printer, wait 30 seconds, then turn it back on and wait for it to initialize. * Remove the extension plate if you are using one. Plug the printer into the power outlet immediately and turn it on. * If the problem notification error persists, disconnect any network or USB cables after that. * Check the firmware version of your printer and, if necessary, update it to a newer one. * NOTE: You can check your printer's firmware version by printing the configuration report from the control panel. * If the situation persists, the installed DIMMs should be removed and isolated. * Try printing any document now. If it prints fine, you should install the DIMM compatible with your printer device.