X problems with Matrox G200 & IBM 14V
 

I just got a nice new Intellistation from compgeeks.com which has a Matrox G200 in it. After installing RH 7.2, my X display comes up with about an inch of black all the way around. Do I need to change my Video Card settings or display settings to use the whole screen? I had the display working on an ancient IBM pc (Valuepoint) without any problems. Thanks in advance,

BJ