like you said in your previous post, you tried it without succes. this is prob. due to the psu not supplying enough current. if 5v@1a would be enough, Asus would have supplied the device with such an adapter. (besides that, electronic devices do need a lot of/most of the power on startup, like a harddrive, It needs power to spin-up, but once it's spinning, it doesn't need lot of power to keep it spinning.)
Be wise, use a power supply wich supplies enough current to make sure, or you might come to wrong conclusions.
