I have a Nextar Digital MP3 player Item# MA933A-1BL. Changed the battery this morning. Now when it is turned on, the initial blue screen with the word "Nextar" is illuminated but it won't go any farther than this. The menu button does not respond nor does the on/off button. If I remove the battery, of course, it goes off. But when I put the battery back in and turn it on the same thing happens. Any suggestions?