With the right build version of sane you can just run it, and it will say that it find the scanner or not.
With the wrong version, you'll only get SIGSEGV and debug output.
Try to run scanimage.exe on the command line without parameter, but with the scanner attached and on.
It should try to find it and report something back other than
scanimage: no SANE devices found
Regards,
//Jan-Erik