Although reading through this thread. You don’t mention which version of Picasso96 (P96) you are using here?
Back when I was first venturing out doing A1200 Mediator Tower builds with Voodoo3 and Radeon cards. I found a lot of trouble getting P96 to work. This believe it or not was down to the version I was using.
Back then I had to use the free Aminet no longer supported versions.
My findings were that version 2.0b was stable enough. But version 2.0e would produce weird picture artefacts.
Now a days I have bought into the now developed and supported P96 off Individual Computers that Thomas Richter (Thor) maintains and updates.
Another thing you need to realise. Not all Montior and TV’s output the same. So you will need to play around with Clock and Horizontal and Vertical sync settings.
Another good tool is UMC off Aminet for calculating these.
