If prompted by Windows User Account Control (UAC), click to allow changes.
This is a classic symptom of an incorrect driver or mismatched baud rates. hp a799 thermal printer driver download link
Error message is generic. Ensure paper is aligned against the right paper guide. Reset printer: Unplug 30 seconds, plug back in. If prompted by Windows User Account Control (UAC),
If you encounter any issues during the installation process or while using the printer, here are some troubleshooting tips: here are some troubleshooting tips: