Why does Visual boy advance give a white screen when you load roms

this is for the white screen

1) open your visual boy advance emulator
2) go to options
3) in the options menu go to emulator
4) on emulator go to save type
5) and finaly on save type chose the option Flash 128k.

EDIT: apparently some roms don't work for it so you have to redownload them. i got Pokemon sapphire from www.romulation.net and it is a fail so just don't get THAT EXACT copy, you can still download all the other ones though