I read elsewhere that this may be a fuse problem...I think my Sega CD Model 1 is also not working. Last night, I was playing my Genesis Model 1 which is connected to my Sega CD. While playing a cartridge game, the audio started to crap out and then the video. I then started to smell something burning, so I quickly turned everything off and unplugged all the cables and power adaptors. I let everything cool down and opened up the Genesis, as I thought it was where the burning smell had come from, but I did not see anything that looked like it had burned or melted. It was a bit dusty so I used compressed air to clean it out before putting it back together. I then reconnected the Genesis back to the Sega CD. While there is power to the Genesis (red LED is on), there is no power to the Sega CD (no LEDs on). I tried to play both cartridge and CD games, and could not play either. I then removed the Genesis from the Sega CD and was able to play cartridge games. I even swapped the power adaptors between the Genesis and Sega CD to ensure the adaptors are working, and they were. So now I think it is the Sega CD itself that is not working, but not sure how though. I don't have another Genesis to test whether it is the expansion port that is screwed up. Any ideas on what could be not working?