You need a specific version of DirectX (9-something - you will have to look it up). EQ does not like more up to date versions for some reason.
The setting I'm referring to is the 'video mode' down there at the bottom. I've found if the resolutions of Windows and EQ conflict (EQ doesn't run at the same proportions as a lot of modern HD monitors), you tend to get a black screen. Check DirectX first, though. That might be the issue.
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