[JAVA3D] Installation Problem

[Steven Cain]

I've tried several attempts to get Java3D working on my machine but when I run a demo, all I get is the "black screen".  I don't know what else to do.   Windows 2000 Prof jdk1.4.1_01 j3d1.3.1_01 beta DirectX9   my path is set and classpath is ".".   Any suggestions?