This happened to my aqua fish , won't charge or turn on. Then I found out that this device could start without battery (connect to a pc without battery). I did that and slipped in the battery unit while device was working but all in vain. No detection when connected to pc not even in recovery mode. Now my device is being repaired in the official service centre. Does not look like a software issue but my device was working well , no problems were there at all. I will ask the repair guy about the cause of the issue.