Unhappy screen problem after install official kitkat rom

i need help with my galaxy mega "i9200" after i install the kitkat rom I9200XXUDNE4 the screen is not working at all even the back and menu button

i tried to install the rom again but it's same thing the screen is not working.

and i can't take the phone to the warranty because the phone it was rooted and it an year and half old

so please help....