I recently acquired a Gameboy kiosk in untested condition. Upon getting it home I plugged it in and found out that the Demoboy II was apparently working. It puts the Gameboy border on the screen, but the gameplay area is just static. The actual Gameboy works fine as long as the ribbon cable is unconnected. Once you plug the ribbon cable in the Gameboys screen goes blank. The power indicator is still on, but it won't do anything until you unplug the cable at which point the Gameboy reboots.
I really want to get this thing going, but I don't know where to start.
Any input is appreciated.