after glass replacement lcd wont come on

so i changed the glass on my galaxy note 2 and when i took of the broken glass and tried to see if the lcd still worked the phone turned on n showed everything then i shut the phone of and was cleaning it with a soft cloth and i tried he phone again because i was going to put the glass on already and the phone didn't want to show any image you can hear sound n the digitizer is working but no image. if your in a very dark room you can see some light on the screen with black spots and everytime i press the power button the screen flickers