I have the same problem. After launching TDM by doubleclicking thedarkmod.exe, I get a black screen, but the sound runs as normal. I also get the mouseover sound effects when I move the mouse over a menu item. This started yesterday, after I updated to version 1.08. My Doom 3 version is 1.3.1.1304, Win7 Home Premium, Phenom II X4 965, 4 GB RAM, ATI Radeon HD 5800 graphics card, native resolution 1680x1050, which I've also edited DoomConfig to. As I don't know what would go into an autoexec file I can't try that option.
