Atari 2600 4 switcher
Atari 2600 Jr.
Sega Genesis Model 1 (x3)
Power Base Converter for above
Sega CD Model 1
Turbo Grafx 16
Sega Genesis Model 2
Super Nintendo Model 1
Super Nintendo Model 2
Neo-Geo MVS 2-slot (consolized)
Nintendo Gameboy Color...
I think Shenmue II was probably pretty close to the limit. AM2 always got the most out of the hardware, and the extreme slowdown in some spots shows that they were really pushing it. It also looks better than a lot of PS2 games.
As far as more recent DC releases go, I think Under Defeat looks...
Ninja Warriors Again is a completely different game; it's actually the sequel to the first. The Sega CD version of the original is pretty sweet, so I would recommend picking it up if you happen to see it.
Looks pretty good overall, although I think a forum for PC gaming is appropriate, and also that the various download sections should be kept separate. Also, it's probably good to have a separate forum for 'Sega consoles' and 'Sega console support'... really it all depends on the volume of posts...
What's your preferred era of Genesis titles? The earlier black box/white grid look, or the red box with the new logo? It's a close call, but I'd have to say that if I could only play games with one type of box or the other, I'd have to go with the classic black box games.
Hmm... a most vexing problem indeed. Difficult to diagnose anything with no video. ;) ... Personally I would try hooking up an older CRT based monitor if you have one around. I have an old single-sync VGA monitor that only does 640x480@60, however if there is a signal at all it will display...