I have two VESA graphics bards - a Stealth Pro, which gives a normal display, and a Mirage V7. The V7 display looks dim, but also has a yellow cast to it compared to the Stealth Pro [or indeed any other machine I use with my monitor].

I'm assuming the card is failing in some way so it's in the trash, but I thought I would post here to see if there is any other possible explanation. It looks like it's lost one of it's colours.