K850i DISPLAY PROBLEM (HELP)

[Ghandra]

...I'm new with this stuff...I flashed phone (A2)...I mean only menu...and after few days i started to have problem...when I'm pressing keys my display turns off or goes black but the lights on the keypad are still on...i leave it till all the lights around the buttons turn off and then i can push a button to turn the screen back on...after 1 day it got worst...now it doesn't turn on at all, but phone still works(i can receive calls) someone please help...does it have anything with the flash menu and changing custom file or?????????????????
...if u need log file i can post it...
...thanx...