Samsung Galaxy S3 will not turn on

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http://forums.androidcentral.com – Hi My S3 is stuck on the initial screen that says Samsung Galaxy SIII GT-19300. It has been like that since I got up. If I press the on/off button nothing happens. If I press it for a long time it the screen goes of for about a second then the same screen appears. I tried taking the a battery out put it back in switched on and the same screen appears. When I connect the phone to my laptop my laptop does not recognise the phone. Please help Ally (HowTos)