Just wondering if anyone on here has come across this type of issue before. Model 1, Serial: 110040340 - Slight video distortion / flickering after 40 minutes uptime. Model 1, Serial: 120007120 - Severe video distortion / flickering after 30 minutes uptime. Model 1, Serial: 41e09193 - Doesn't seem to show any flickering of video distortion at all after 60+ minutes. Zyrobs (from here) pointed out to me that the HUD in Doom is fine because it is rendered by the Mega Drive. However, I am curious as to why this happens to different degrees on two of my Mega Drives but the issue is completely absent on one of them. The above photo galleries have photos of all the internals of the Mega Drives, so if anyone spots anything that may cause this let me know! :biggrin-new: Of course if anyone else can replicate this issue on their own Mega Drives / 32X that would be helpful as well. I've tested across four different 32X units, so it does not seem to be the actual 32X units or I have really bad luck at finding working 32X units... The serial number range on the 32X units is from 15107xxxx to 15108xxxx - not much variety there at all, probably because not that many were made. I did have a poke around in one of the 32X units and cleaned the two ribbon cables as well as cartridge connector, no improvement though. I've got power supplies running all over the place and changing those doesn't seem to make a difference either. Anyone feel like chiming in?