It was the CPU board. Just got a replacement today and seems to work fine with the video.
So if you get a rolling video screen on both RF and monitor out, and your unit is not PAL on NTSC (or the other way round) and you have tested the voltages, and reseated/ swapped the RAM to test, and tried reseating CPU chips, try replacing the CPU board.
Thanks again for all those that helped me get my atari monitor displaying again!!!!