My phone will not play audio when I use video record. It will not play sound when I try to watch YouTube videos, I have all my sound settings on loud, but still no sound.
Welcome to Android Central! Which phone do you have? Does the phone still ring when you get a call, and do app notifications still make sound? If you set an alarm, can you hear it? If so, make sure your Media Volume slider is turned up -- remember, there are usually 3 different volume controls, for Ringtone/Notifications, Alarms, and Media.