Samsung s3 (kies firmware upgrade,start upgrade greyed out??)HELP

Hi i was wondering if anybody can help me out please?,I have a samsung s3 was working fine one day and next day wont charge,and just get samsung logo when power on,...ive downloaded kies and kies 3 on two diff laptops,...ive put in s/n,model etc on kies and done all the steps ive read about to update firmware (and left usb in phone to pc overnite to see if the greyed out upgrade start button would find phone etc but hasnt)..im going to throw the phone out in mo as nothing works!! just wondering why wont the greyed out upgrade button turn on so i can upgrade phone??...ive used 3 diff usb cables all from samsung chargers,there all new,ive tried kies and kies 3,ive got 2 laptops rigged up,ive left it running all nite, yet it still wont let me press START UPGRADE its still greyed out PLEASE HELP thanks

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