I recently bought a new Zoom G2.1u effetcs processor from singapore. A problem has cropped up suddenly it works with batteries but not with the zoom power adapter which i bought? i also tried some other adapters but they too not working? what do I do now? Its really urgent.! I bought an original Zoom Adapter of 300mA, i tried a 1000mA adapter of some XYZ brand that seems to work. But is it advisable to use that?