It is annoying to have to leave the blue led on and the scanner connected. Continually disconnecting the USB cable when not in use is not a good idea. I am having problems finding a cable that will provide power and data transfer for the scanner with an on/off switch. Should be a simple thing to find! The Epson Perfection V39 II scanner uses a Hi-Speed USB 2.0 interface with a USB Micro-B connector. Comments, help? Thank you,