How should I do when my computer or DocAction can not detect scanner?

Check the USB cable connection between the computer and scanner(Do not use USB hub).

Make sure the scanner is power on.

Please try manually installing the software. (For Windows OS)

a. Right-click on Windows Start and go to Device Manager.
b. In the Device Manager window, right-click on this scanner under Other devices and select Update Driver Software.
c. Click Browse my computer for driver software.
d. Select the folder or the CD/DVD-ROM drive that contains this scanner’s driver and manually run the install.exe file.