Hello

Ive a black screen on latitude E6440, i checked with external monitor, did power cycle, checked rams, disconnected CMOS Battery... monitor test with D+power checks ok, i can clearly see colors. But still black screen after that, a few times i managed to turn it on by trying to turn it on and off many times. 

After i disconnected and reconnected Cmos battery,  i have constant fan sound, before that it would run for 1 sec and stop. Now in front by the power button Ive only battery indicator on (middle one) and on the back ive left and right on and middle off. And i think power button led is bit dim.

Ill be appreciated if anyone can help