do you have the latest radeon drivers?
do the demonstaration bits of code work correctly?
I upset classic once by tweaking the gfx card settings, have you been playing with settings, things that affect nothing else can upset DB for some reason.
what version Directx do you have? if 8.0 or lower then try upgradeing
classic doesn`t like multimonitor so if you have a tv or second monitor plugged in then disable it and try again or unplug it and reboot, other than that I have no idea, when classic programs start on this machine I get a screen full of white and black strips for a second before the code runs, other than that classic works fine here.
Mentor.
PC1: P4 3ghz, 1gig mem, 3x160gig hd`s, Radeon 9800pro w cooler (3rd gfx card), 6 way speakers.
PC2: AMD 2ghz, 512mb ram, FX5200 ultra, 16 bit SB.
Mini ATX cases suck.