I didnt find anyone mentioning here being victim of this. but on most other forums there are plenty who have encountered this
specially on evo 3d and few on evo 4g.
the screen turns dark but touch remains working as well as the touch buttons. reset, restart, nothing seems to bring it back to life.
BLACK SCREEN OF DEATH (popularly known)
so finally i even ordered a brand new screen+display from etradesupply.com and even after replacing it remains the same.
any tips or guidance is highly appreciated as the phone has become useless. cant enable to debugging too to do other tweaks or updates.