Support S3 - not turning on etc.

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http://androidforums.com – Hi there, Woke up this morning and noticed apps kept crashing oddly so I thought I'd restart the phone.... it just gets stuck and goes round and round on the 'Samsung Galaxy SIII GT-19300' and Orange splash screens... doing nothing. I tried to do a hard reset but that doesn't even get to that screen as that also keeps going round. Help would be appreciated. I'm not on Jelly Bean yet as I've still not had the notification to update. So I think I'm on 4.0.4? I'm on EE (Orange). Thanks. (General)