OK, latest in my sad tale. I shut down the PC for a while, see wah happened after reboot. In the meantime, I downloaded JRiver 18 for Mac, and learned that since I bought it, they upgraded and are now on 19. Macs are finicky, don't like to download non Apple store software, took me a while but downloaded, entered codes, upgraded to 19, imported media, plugged in GO 1000, nothing! (not completely true, music played through the computer speakers, but not through the GO. I thought the Mac version autoamically recognized GO and you didn't have to do anything, but I couldn't figure out how to get sound through the GO->headphones. (I have to say, I think documentation for this stinks-I can understand it from a Chinese company not set up in the US, but there is no excuse for the lack of guidance on this imo). Anyway, since I failed on the iMac, I went to see if the PC was behaving better since the reboot (remember, when I first got the GO, I installed the drivers to the PC and it was playing through JRiver fine, loved it in fact). The PC was now playing music through speakers (which it hadn't done before), but when I opened JRiver, tried to listen to music through GO, nothing. Not sure what to do next, getting frustrated. Any ideas? Thanks.