backup first
• Turn the iPad off and on again (hold the sleep/wake button for about
3 seconds until a red slider appears with the label "slide to power off")
• If it din't help, try a hard reset - hold the sleep/wake button and
the home button simultaneously for about 6 seconds, until the iPad tunes off
. Then turn it on again.
• Go to "Settings - General - Reset" and choose "Reset All Settings"
Restore