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Hi @chander4u, welcome to our community!
I'm sorry to hear about your phone.
I would recommend that you start with removing the battery in your phone and putting it back in place again.
I posted a picture below so you can see how to remove the back cover of your phone!
If the battery is completly drained in your phone it might take 3-4 hours before you will see that the phone is charging, so connect your phone to a charger and charge it using a wall socket for 3-4 hours.
Xperia U has reached end of support so you will not be able to use any of our software to repair the software or such in the phone.
I wish you the best of luck with getting your phone powered on again and let me know how it went!