[ubuntu] MP3 Player can't connect - "Unable to enumerate USB device on port x"

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http://ubuntuforums.org – I have a SanDisk Sansa Clip Zip mp3 player. When I plug it in to the USB port, I get the following: $ dmesg ... usb 1-3: new high-speed USB device number 11 using ehci_hcd hub 1-0:1.0: unable to enumerate USB device on port 3 The Sansa does not show up in lsusb, or in fdisk. I believe it is not a problem with the cable or the player, as a test-run on a Mac worked fine. Beyond this, I can't really figure out what's going on. Does anyone know how I might troubleshoot this further? Many thanks. Running Ubuntu 12.04, kernel is "3.2.0-33-generic." The Sansa Clip Zip has the latest fir (Hardware)