I have 2 N64s, I have plugged them in and tried multiple cartridges, it will power on with the red light and you can here the speakers kick on when i switch it on, but other then that I am getting no sound or video off of ether of them. I have tried 2 wires and even tried the wires on my Gamecube. The Gamecube works fine with no issue, but the N64s have no signal. I have blown everything out with canned air. Any ideas? I am using a flat screen TV and have tried changing the video settings too.