Backtrack only taking up 1/4 of the screen,.

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http://www.backtrack-linux.org – I just installed Backtrack 5 R3 Gnome 32bit on my other computer but it only takes up approximately 1/4 of the screen(the rest is black). If I go to System->Preferences->Monitor it says "Monitor unknown". So what could this be? Is this a common issue? Could I just reconfigure X or do I need new drivers? http://www.backtrack-linux.org/forum...ad.php?t=46887 http://www.backtrack-linux.org/forum...l=1#post206708 Unfortuneately the computer is not available now so I can't post specs. (HowTos)