Samsung galaxy s3 screen shows gobbledygook

Woke up in the middle of the night and my s3 was stuck on the samsung screen with the whirly blue logo.This has happened a few times recently so I did what I always do and removed the battery as nothing else works. Now all I get is a white screen with horizontal lines which look like they should be text.
Phone wont go into safemode and the reset using power home and volume doesnt work either.
Please help.

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