|Press the home button to come out of the app onto the home screen.|
|Double-tap the home button to show all the apps currently running on your phone. They’ll all appear at the bottom of the home screen. You can swipe across to see all the apps you had running at the same time… Quite a few?!|
|Press and hold one of the app icons in the bottom row until the icons start jiggling.|
|One by one close all the apps but tapping the little stop sign on the corner of the app icon. Don’t worry, it’s just like shutting down programs on a computer – you’re not deleting them, just exiting them.|
|Once you’ve closed them all, press and hold the Home and Lock buttons, then keep holding them. Your screen will eventually go black.. keep holding until the Apple logo appears.|
if you’ve got no sound on your iPad, you can also follow the steps outlined above as they apply to all iOS devices – iPad, iPhone, iPod Touch.Also, there was a bug in an old Apple firmware update that added the ability to select the function of the side switch between mute and rotation lock. This bug affected the sound in some apps, and is very simple to fix. Simply go to Settings->General and switch the “Use side switch to” from whatever it’s set to, to the other option and back again. This should solve the problem with some apps that use sound.