It sounds like the 600 is getting only a partial connection. My first guess would have been the cable, but you're ahead of me there. Is the charging light on the 600 coming on?
I'd get some canned air and dust out the USB sockets on both the computer and the reader. I'd also try it on a different port, or if you're going through a hub, without the hub. Also, just for the sake of completeness, I'd test it on a different computer (don't need the software, just see if the OS recognizes it as something).
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