I Picked up a boxed 5200 today from my local Salvation Army, It's in beautiful shape, but when I got it home and hooked it up, all I got was a garbled mess. Hoping someone can point me in the right direction, as I would really like to get this guy working. I have cleaned the pins on the console as well as my games with rubbing alcohol. I have it hooked up via one of these things, and am using the Atari brand power adapter that came with it. I have tried every possible combination of channels/switch positions too.
Here's what I usually get when I try to play some Pac-Man:
And here's what I get once in a blue moon if I wiggle the cartridge just right:
Any ideas what might be wrong here?