Hissing sound with wi-fi and power adapter connected

This is quite annoying - when the power adapter is connected and I have a w-fi connection to the internet I get intermittent 'hissing' sounds - however when I remove the lead and run off the battery this no longer happens. Does this happen to anyone else?!

What problem are you having ?
If you have the 'this iPad hasn't been backed up' message on screen and you can't remove it try a soft-resetave you tried a reset ? : press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider if it appears), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.
When the iPad has restarted you can then force a backup via Settings > iCloud > Storage & Backup > Back Up Now

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