I'm assuming from your description that the LCD display has both VGA and DVI/HDMI inputs and that the Mini is connected to the digital input all the time.
I'm also assuming that the IIfx loses its video setting when you switch away from the VGA input on the display to the DVI.
I'm not sure whether the Thunder has a VGA connector on it, or if you are using a DB15 to VGA adapter.
When you say the image you get is washed out, does it display any particular tendency toward one colour or another, maybe kind of pinkish?
Just a WAG, but it sounds to me like the LCD might be complaining about the scan rate its receiving at first and then dropping down, and the II fx might not be getting sync on green.
The Thunder probably tosses out 67 Hz to start and the LCD goes, "what you talking 'bout Willis?", then drops to 60 Hz.
Any change you have a toggle switchable Mac to VGA video adapter around? Throwing a video adapter onto the Thunder before connecting to VGA and leaving it hardwired to a setting the Thunder II, the II fx, and the LCD display all understand might do the job. Find a common setting that both the Thunder card and the LCD display explicitly support in their manuals, maybe something like 1024 x 768 at either 60 or 75 Hz.
I'm also assuming that the IIfx loses its video setting when you switch away from the VGA input on the display to the DVI.
I'm not sure whether the Thunder has a VGA connector on it, or if you are using a DB15 to VGA adapter.
When you say the image you get is washed out, does it display any particular tendency toward one colour or another, maybe kind of pinkish?
Just a WAG, but it sounds to me like the LCD might be complaining about the scan rate its receiving at first and then dropping down, and the II fx might not be getting sync on green.
The Thunder probably tosses out 67 Hz to start and the LCD goes, "what you talking 'bout Willis?", then drops to 60 Hz.
Any change you have a toggle switchable Mac to VGA video adapter around? Throwing a video adapter onto the Thunder before connecting to VGA and leaving it hardwired to a setting the Thunder II, the II fx, and the LCD display all understand might do the job. Find a common setting that both the Thunder card and the LCD display explicitly support in their manuals, maybe something like 1024 x 768 at either 60 or 75 Hz.