Under Sound>System I have everything checked except Vibrate on touch. I hear a very soft tone when using the dial pad but nothing when making screen selections, locking and unlocking the screen and when refreshing feeds and content. I have checked, unchecked and checked again with no sounds. I have rebooted and no sounds. I have installed the apps Volume Control + and Audio Manager to boost the volume on system sounds and neither worked so I uninstalled them. I have read that this Android problem may have first appeared in 2011. It has also been suggested that the various sound files for these sounds are missing. Is there anyway to check if this is true? Is anyone else having this problem with the HTC One M8 and is there a solution? Thanks.