Hi, Not too sure how it happened, but my Sony NW HD3 seems to have locked upcompletely. The track info is on the screen but locked. I can't get any of the buttons to work. I had thought of turning the inbuilt battery off and on again, but need to know if this will wipe the songs of the device ? I've got 20 gigs worth and due to a recent computer change don't have them backed up !! Can anyone help.