After iOS 5 update two thirds of the screen is black

A few hours after my iOS 5 update two thirds of the screen is wiped out (black). The touch gestures work fine on all the screen, I just cant see two thirds of it.  Picture of the screen attached:
Has anyone seen this before?
I restored the iPad to its defaults but this did not resolve the problem.
Many thanks!

Does it stay black in the same area whichever way up you hold the iPad ? Have you tried a reset ? Press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot. But you may need to contact Apple

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