I have an Asus C434 flip Chromebook and after the last OS update I no longer get any sound through my speakers. The mute button and volume buttons respond. The up volume buttons only unmute the sound but does not increase the volume. I've tried using the head phone jack with external speakers and headphones but no luck. I can get audio with a Bluetooth speaker but would prefer my Chromebook speakers to work. I've done several power washes on a stable channel but still nothing. I read another forum about holding the mute and volume buttons then shutting down and repeating this process several times to get the sound working again but still nothing. If any one else has had this problem and knows of a solution it would be greatly appreciated.