ok guys so here i am sitting with my brand new ATI Radeon x1900 XT graphics card and after 15 mins of laboring to get the stupid thing fit in (quite a feat in itself considering the thing is nearly a foot and a half long) I turn on my Mac pro to see nothing. I have been doing a lil bit of looking around and it is indeed the mac upgrade version (with the white box and extended chasis) but i can't seem to figure out what is wrong. Please any help would be nice.