Mine will come on with the charger but will go off after a minute or so. It will not charge the battery or power on with the battery. Battery is known good. I am at a loss.
I just got a GBC with no sound so I replaced the speaker and the sound worked but the screen was not functioning normally. I took it apart again and re-seated the cable and now there is no screen at all. The game works as I can hear the sound.