I have a Nexus S, running Android 4.1.2.
Just noticed today that I couldn't shut off the alarm by pressing the volume keys or the power button. Usually, when the alarm goes off, the phone displays 3 options on the screen, including snooze and disable. I did not see those options.
Secondly, the zoom feature in the camera app does not work when I press the volume buttons.
Please help on how I can correct this.