I was very happy to power on my 2nd non MAME arcade cabinet dedicated for the first time and even to see a picture even if it was all screwed up made me happy! I have a brand new Happ 19'' vision pro. the happ wire harness has these colors:
red, green, blue, black, white, yellow
my jamma harness molex connector which doesnt fit the happ monitor anyways only has:
red, greed, blue, black, white, *no yellow*
first powering on it was more or less just red crap that looked like this:


then after fooling around more with the wires it looked as if it was scrolling slanted at a weird angle, mainly red and tough to make out what game it was but you can see here Gun.smoke :

