Non-vga game ----> Vga-game

[Jimi_84]

How can I convert a non vga-game to support vga?
I have a copy of DOA2 that I made selfbootable but it doesn't work with my vga-box.. Dc complains that that this game doesn't support the type of av-cable blah blah.. The same thing happens with Skies of Arcadia which has an echelon intro/trainer at the beginning. Would it help to remove the intro? I dunno if skies of arcardia PAL-ver supports vga anyway, but if somebody has a solution please share the info