Originally Posted by gswarbrick
Initially, it wouldn't switch on at all but, after a while it showed the battery empty gauge and wouldn't turn on, even though the power cord was attached - and, in any case, it should have been fairly well charged.
After a while I opened it up again and it had a dialog in the centre of the screen saying 'Android is upgrading... Please unplug the power adapter before updating the Pad firmware'. I did; it turned off.
Subsequently, though, it turned on with the power and dock connected and everything was working as normal. The dock was charging, but the tablet wasn't.
I've done a factory reset from the Settings menu to see if there was something about the interrupted firmware update that had stopped it charging and it still worked afterwards, but still wouldn't charge. I did an erase/reload from the Bootloader menu and that didn't help either, but then prompted me for a system update. This insisted I had the power cord in (which seemed to make more sense...) but after the first reboot it didn't restart. I gave up at that point and, when I went back it was saying 'Android is upgrading... Please unplug the power adapter before updating the Pad firmware' again.
This is probably a bit late to help, but for what it is worth, I have had a similar problem with my almost new ASUS TF701T; it simply would not charge. Dock battery State of Charge (SoC) fell to 0% (although all keyboard functions operated normally, I suspect powered by the Tab battery), and the Tab SoC steadily fell from a high % slowly towards discharged.
Nothing I could do would get the thing to charge, either the Tab or the Dock.
A bad charger or a bad cable was the next thing to suspect. I did try to charge from different power points - always the same. No charge (although, to be fair, the "Power Saver" icon did show that charging was occuring, but still the SoC fell. There were no charging lights on either the dock or the tab).
I considered Factory Resets as suggested by various forums, but fortunately, I didn't. I eventually ordered a new USB charger cable. And still no charge.
It was then, by accident, that I tried yet another power outlet for charging - heh Presto! Full charging almost immediately.
What had changed? It was then I noticed that on all previous charging attempts where I experienced this difficulty, I was plugging the charger into either power points, or power boards which had "surge protection". And by chance, this last time, I had plugged the charger into a "non-protected" power outlet.
I have since replicated the problem, and as such I have concluded that the ASUS charge adaptor does not like power which is subject to "surge protection" as so many power points are these days.
In my case, the power network is 240VAC 50Hz, but I suspect that "surge protection" can be implemented on any grid power system.
I hope this helps someone.