Can't get any sound from internal speaker. No notifications, no music, no media, nothing. Sound works as it should with earphones, but nothing from internal speaker. It has worked in the past, so the speaker was not DOA. I'm using superuser rooted but have not made any major system modifications and am running stock ROM. I have know idea if it is a hardware or software issue. The device has not been dropped or otherwise abused, so a hardware issue seems doubtful. Any suggestions?