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Cause:
Battery is 100% discharged. Therefore, PC's USB with 5V/500mA set up has not enough power to start up the charging process because loading current is greater than the set up, therefore USB is disabled immediately due to sudden current load. Remedy:
Battery must not be discharged 100%
If it happens then the supplied AC adaptor must be used firstly because it is providing 5V/800mA power. After a couple of minutes the unit can be connected to PC without problem then it can continue the charging during file transfer, etc.
I had a similar problem with my Sony NWZ-818 today and simply pressed the reset button with a pin to reboot the player (little hole on the side) and it worked!
This is how i made mines work: http://esupport.sony.com/CA/p/model-home.pl?mdl=NWZE344&template_id=1®ion_id=3&tab=download#/downloadTab go to the link, will lead you to Sony eSuppot - Driver and software , download firmware update, remember to keep your Sony NWZ-E344 plugged into your computer and clicked the reset button while its plugged into the computer before starting this, this worked for me, hopefully it also works for you :)
I had the same problem. For at least a week. Try pressing the reset button. The reset button won't delete your music, videos, pictures, etc. Just resets your system. If that does not work then i don't know what else to tell you.
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