Same thing happened to me with most of my games, and then i put the usb in my computer to see if i could fix it, removed some of the homebrew files incase any of them were corrupted, then i put the g6 real back into my DS, turn it on and black screen! I replaced the firmware with the old system firmware and it says 'system folder not found' so i run the mini loader (but can't do anything on it). Then i formatted the G6 and i get the same problem, anyone know how i could fix it?
EDIT: I managed to get it working again but my save files have gone
I told my mum to put my DS in her handbag, the button was magnetic, but couldn't have been that powerful, yet all my files became corrupt ,these things weren't exactly made to last were they? This is the second time it happened and now i'm really pissed cos i've had to complete mario kart twice (all difficulty levels, all missions) and now it's erased again