Do you mean on no$gba through no$zoomer ? Download this package http://www.mediafire.com/?js0l3kmi9pxigiu And run no$zoomer, usecrypt=1 should already be enabled in no$zoomer.ini file , then run your game Are see this topic for over ideas http://forum.romulation.net/index.php?topic=50586.0
Did you use the package from that thread? Make sure all require files are placed in the folder. After you had set up the emulator to BIOS, restart it.
If you didn't get into the BIOS screen, and stays on the white screen instead, you likely missed some steps from that tutorial. Delete doing it on the fresh copy again.
A BIOS screen will look like this If a crash you ROM is not encrypted, I would use a copy of the original ROM to encrypt it Post Merge: [time]1302960968[/time] http://forum.romulation.net/index.php?topic=54580.msg1265897#msg1265897
Depends on which games, most of the newer games need to be run through BIOS to make it playable, including GS. Try doing it again, use the fresh copy.