Id test the display on a PC, is it still dim?
Then Id test as many other monitors as I could on the card...
I vaguely remember reading something years ago about the Amiga RGB signal being too low for some PC monitors, I dunno if this applies to picasso - iirc people talked about adding a video signal amplifier.
MastaTabs post about sync on green rings a bell too, def worth a try.
Good luck!
