@rob1n, LOL i dont have problems before it goes flat either.

@ dwould, i just connected my phone using the official nokia usb cable packed with my n900 and im charge it with the computer. I can even look in the mass memory of my n900 but there is nothing charging. screen is completly black (no backscreen on) and no LED is flashing burning. MAybe it is charging but i cant see any sign of it. When i hit the power button the phone starts and the charging LED pattern is shown.