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First make sure you don't have the mute switch turned on. If it is, then turn it off. It is above the volume up/down buttons.
If that didn't work, then press and hold down the Power button and Home button at the same time until it shows the Apple logo. When you see the Apple logo, release the buttons and let it boot.
Please let me know if that didn't work, so we can continue troubleshooting.
Hi there, Please reply back in here instead of posting new questions.
Is the mute switched turned on or off ?
Which model of iPad is this ? iPad 1,2,3,4, Air, Mini etc ?
What version of iOS are you using on ? iOS 7,8, 9 etc