Hello everybody. I have a Sega CD Model 2 and a Genesis II and they are having this weird problem and I've been trying really hard to find out what it is. So, basically, there is this humming coming from the speakers whenever the system is on, and also this image distortion/flickering. I am using a 10V 1A DC adaptor for the Genesis, and a 9V 2A adaptor for the Sega CD. (Both generic). I should also clarify that neither the Genesis nor the Sega CD have the internal metal shields and I'm also not using the mounting plate (I didn't get it when I bought them). I've been trying different combinations of things in order to find a pattern but I couldn't , so I'm just going to type down everything I did and what came out of it. Using the Genesis ALONE unattached to the Sega CD: Clear audio , clear video (at least most of times, very rarely the video would also look a little flickery) Genesis + Sega CD, both plugged, playing a SCD game: Humming and video "interference"(?) (Horizontal bars moving vertically really fast). EXCEPT sometimes! I don't know why but sometimes it works just fine! Genesis + Sega CD, both plugged, playing a Genesis game: Same as above. Genesis + Sega CD, only Genesis plugged: Very loud humming and significant image distortion. I also noticed that the humming is very quiet during the TMSS screen or any other blank/black screen. It's so frustrating not knowing where to look! I am trying to sell these consoles which is why I'm so interested in fixing them. If anyone knows what it might be, I'd be SO grateful. My attempts to fix the problems: cleaning the cartridge slot with a toothbrush dipped in rubbing alcohol and cleaning the expansion port with acetone. I probably could have given more details about this or explained it better, so if something isn't clear enough, just ask.