I also did a thing like this. I rooted the phone and it workd, than I tryed to install xPosed, it robooted, but the screen turned black. Than I started the phone in recovery mode and tried a factory reset, it turned black and now I think it's bricked. When i put off and put on the battery it makes a short logo animation and than turns black.
I tried with sp flah tool but it doesn't start or not recognise the phone, the driver are installed but with my pc and my laptop it doens't work. I hear the sound of when I connect and disconnect the phone, but apart from that it's dead. Please help me!