I have the same problem. Received my N900 yesterday. Removing battery does not work, also other solutions fail.

But I found a solution. Charging with the USB via the computer works, and you can use the charge-adapter. This accesoire (that came with my N900) lets you use a different charger. So I hooked up my Nokia E61 charger en plugged it into my new N900 via the USB-charger-convertor (charger adapter CA146-C) and it works!

Look for more information about the charger adapter on
http://europe.nokia.com/find-product...dapter-ca-146c