so a while back. i picked up a japanese neo geo aes. the system works, but it has lines running across the screen. everyone who's seen it say the lines look like really thick scan lines. i dont know how to explain it. sadly i dont have the system with me at the moment to take any pictures of it.

i've done a few basic trouble shooting steps, like trying different ac adapters and different video cables and games. but the lines are still there. when i power the system on without a cart. it shows the blue screen indicating every things fine.

any suggestions on what to try next? could there be something wrong with the video ram?