if it's definitely only the background and has perfectly white windows and menus then it's got me stumped. However, E-Machines were a branch of Radius and I know practically all Radius and Supermac NuBus video cards use SoG.

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It's not just the background; the windows and menus have a slight green tint also. So I guess that means it's the sync-on-green problem, even though I'm not sure of the exact details of that. If someone wants to give me a short tutorial it woud be greatly appreciated.