Atari Heavy Sixer Issues.

[RetroHacker]

Might be a bad TIA chip.

There are only three chips in an Atari, and they're the same between all versions (except the very late 2600jr) The CPU, the RIOT, and the TIA.

Can you hear the game playing at all, or are you getting just a solid tone/sound and the rolling image?

If you have another Atari with socketed chips, just swap one at at time until you find the bad one. But issues like this are usually the TIA, occasionally the RIOT.

-Ian