Advance Wars 2 ROM Problem

Hi, i cant work out why i cant get AW2 to work...ive got 2 other roms for this emulator and they both work fine...however with AW2 it loads the rom and then sits on the main screen menu saying press start...if i press start it restarts back to the into thingy until it gets to the press start screen again...ive downloaded 4 AW2 roms and they all do they same thing..can any1 help me?