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If your screen does not react to touch then it sounds like a hardware issue but I can only go off what you describe however for issues like this you would need to either return your device to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/
That symbol is mobile data disabled - Normally seen on boot up
To reset your phone you do need a Pc to either perform a system repair or access MyXperia to change the security code but as it appears your phone is in Airplane mode I fear this also wouldn't work
If your screen does not react to touch then it sounds like a hardware issue but I can only go off what you describe however for issues like this you would need to either return your device to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/
Did it get wet at all?