help with mvspsp 2.3.1

[elbobby]

Hello I RECENTLY DOWNLOADED MVS(NEOGEO)2.3.1 EMULATOR.wHEN I PUT AL THE ROM IN 2 GAMES START FINE PLAY NICE EVERYTHING RUNNIGN SMOOTHLY EXCEPT HOW CAN I PLAY WITH EVERYTHING DARK. eXPLAINING THE GAMES WORK, THE CACHE WORKS BUT IS LIKE PLAYING WITH YOUR PSP SCREEN TURNED OFF. CAN SOMEONE REALLY HELP IN THIS SITUATION EVERY HELP IS APRECIATED??\

P.D. fAT PSP WITH 4.01M33 WITH THE 1.50 KERNEL ON.