If you have an HP Printer and enter HP Printer error codes like the error code 79, then you can follow the below-mentioned troubleshooting steps to get rid of the error: 1. Locate the on/off switch of the HP Printer. You can find it at the bottom of the printer. 2. Toggle the switch to the off position and wait for about 10 seconds. 3. Press the power button again to turn the printer on. 4. Check if the error of your HP Printer is resolved. 5. If the issue persists, you can check the firmware version of the printer. If it is outdated, update it with the new firmware version available.