This is what I did and it worked for me. I downloaded the Asus Ai charger utility. That allows your USB port to put out more current.
A quick search found the free download here:
http://www.softpedia.com/get/System/System-Miscellaneous/ASUS-Ai-Charger.shtml
I'm not sure if that's where I got it but it's been working trouble free for me.
Michelle Ress
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