in what format did you tried to reformat your MicroSd Card? FAT or FAT32. The legacy (original) SD Card driver only supports FAT. So put the Card into your Computer, right click on it, and check if it is in FAT Format. If you`ve allready done this, then I have no idea what it could be. Maybe the Card itself has some defect, or the pins in your PPCs MicroSd drive are some sort of bended. You might check that as well....