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Sticky on/off switch. Turn the on/off switch on and off a few times.· Possible faulty power connection. Make sure the power supply actually has power, the adapter is properly connected, and the power switch is turned to On. · Anti-virus software may be interfering. Lower your anti-virus or firewall’ s security level or disengage it while installing the CZUR software. Then reengage it. · Faulty software download. Download the software again & make sure it completely downloads before trying to install it. · – The software cannot be installed. The software will only work on a Windows XP,7, 8, 10 or 11 System and some macOS system. Or you may have entered the wrong scanner SN. Check the scanner SN underneath the base. Note that there is no number 1 (one) in the SN. · – When first using the software, nothing shows in the preview frame, and I am unable to scan. – SN errors. The scanner’ s SN is underneath the base. Note that there is no number 1 (one) in the SN. · – Unable to turn the scanner on. The LCD screen and power indicator light are dark. 3.1 PC Mode (USB) Problems Chapter III Frequently Asked Questions and Troubleshooting