I would really like to solve this problem....
I am stuck here.. could it be both monitors are too "dim" for the picasso iv ?
I am using a standard PC CRT monitor which i found at work
Another problem could be with the CRT's themselves, if they're getting on a bit the Lineoutput Transformer could need tweaking. This is not a job for a beginner though as there are very serious voltages in that transformer.
If you want to attempt it though, take the back off the monitor and you will see a large black bok with a thick wire connected to the tube. On the side of that are 2 controls, one adjusts the focus, the other the brightness. find a long piece of wood (a chop stick trimmed to a flat end like a screwdriver works well) and turn the brightness knob clockwise a little then do the same for the focus as it will be effected by the brightness.
WARNING: touch the wrong thing and you will go flying across the room. only do this if you know what you're doing.
A far safer option is to buy a cheapish 15" tft monitor/tv that has both vga, composite and rf inputs which let you plug several machines into it without having to swap cables all the time.