SO I got a Gameshark Karabiner Cheat device for the GBA, and it won't work on any GBA. I tried the SP, Advance, and Micro no luck. Is it a contact issue? or does it need cleaning? I cleaned out the to-GBA contacts and the Nintendo logo show up, but then it white screens. It is strange, because if I turn the cheat switch off, the game starts normally and plays perfectly. but the cheat menu won't show up. Any way to fix this? Any help would be appreciated. Thanks.