Have tested all types of music or apps but none of them actually played any sounds. I can hear voice calls and using headset but not in loud speaker. have also done most of the work around found in the site but none worked for me. Really need to know if this is an os bug or a hardware issue so I can do the necessary action. From what i've heard its mostly due to the os bug in 1.0.273 release. So hope that this would be fixed soon.