MacBookPro Battery: cannot be charged!

My MacBookPro, about two months old, is working well, except that the battery is not charged up for last three days. System profile says that
Power
Connected: Yes
Charging : No
Besides, the orage light is not on at a little white connecter.
So as far as my MBP is connected to the power supply, I can use it.
I called the call center. A lady kindly replaced the power supply white box, but it does not help at all. So I called it again. This time the other girl offered me to replace the battery. I will see the result hopefully in a few days.
It seems to me that the hardware is not the problem, but that some softwares made the trouble.
I would like to have some suggestions from the exerienced people.

It may well be the battery. All lithium polymer (and lithium ion) batteries have a built in microprocessor. If that microprocessor detects a condition that could lead to catastrophic failure of the battery, it will shut the battery down permanently. It is there to prevent overcharging of the battery because overcharging a lithium battery can lead to a serious problem.

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      ID:    0x0100
      Wattage (W):    60
      Revision:    0x0000
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