Originally Posted by adsum

I had this problem too. I registered because so many people have had this problem and the answer is simple and I wanted to share it.

Go into your clock, click on the alarm you're setting.

Then, click on "Alarm Sound." Choose your sound, AND be sure to hit the volume up rocker on the side of your phone. For some reason, the alarm is either initially set at silent, or it gets turned down to silent when you silence your phone.

Either way, make sure your alarm sound is up at an audible level so that you can hear it.

Hope that helps!