Why my IPAD 2 LCD not Lit After Reconnect after screen replacement?

Hello iFixit i've replace my ipad 2 screen..the problem is i remove the LCD connector as i've seen in the DIY Phone Doctors video. When I Reconnect, the LCD screen wont lit. FYI while i'm working to remove the front screen i was inadvertently touch the power button, thus the ipad was in ON state. due to my screen cracked so much so i didnt turn off back the power button..assuming the touch screen not working after it cracked so much on the whole screen..and just simply assumed no shortage will happen if i'm not switch off the ipad. Now the LCD doesn't lit up..and the power button also malfunction..i do not know why..kindly help me solve this problem and help my DIY..