@magic
The key to solving your problem is in jabirulo's post. Specifically, this bit:
Quote:
IIRC is PCIGraphics.card V53.4 fault, try to use/revert to "old" V53.3.
First check what version do you have (and post it here if you want).
One of the PCIGraphics.card releases introduced a bug that caused trouble with the Sam460ex's on-board graphics. Either update to PCIGraphics.card version 53.5, or roll back to 53.3. To get version 53.5, install AmigaOS 4.1 update 6, and then run AmiUpdate from the Workbench menu.
Hans
P.S. I suggest getting a quieter Radeon HD card, as the Sam460ex's on-board graphics is pretty limited. There are quiet Radeon HD models.