I haven't used my Coolscan IV since moving to Windows 7 several years ago. Tried to use it with Silverfast on a windows 10 machine without success. I now have a Mac with OS X. After reading multiple threads here on photo.net I now know to try VueScan instead of SilverFast but I think my problem runs deeper than that. My computer does not recognize the scanner at all. It does not appear in the "printers/scanners" list. When turned on it runs it's normal POST test and the green light comes on steady like it always has. I have tried two different USB cables without success. Has anyone encountered this same problem? Any help would be greatly appreciated.