Sorry to hear about your problem!
I suggest that you remove the battery and put it back in. Then charge your phone using your wall charger for a couple of hours.
If the phone doesn't start I recommend that you try to repair the phone software using the program PC Companion:
http://www.sonymobile.com/update
In PC Companion, click start under Support Zone > start under Update phone software > select Repair phone (in blue text) > Do all this without having the phone connected to the PC.
Then follow the instructions given to you in the program.
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