My computer's power adapter is plugged into a power source, yet the indicator light is not working and my computer is not being charged.

I have the same issue.
The magsafe goes orange for about 20 seconds, the battery shows 0% then it goes to a black X indicating no battery installed.
With a new battery the same happens, although it can run on battery but does not charge.
It runs fine on mains power, the green light is always lit.
I have tried several things so far:
1. Cleaned the magsafe contacts on cable and macbook
2. Reset SMC and PRAM
3. Installed latest battery update
4. Tried new battery
5. Put old battery in fridge for an hour
I work in IT and am fairly confident taking it apart, what should I try next?
Some people recommend a new battery connector, which doesn't seem to make sense as the battery has never been removed before. Also some people say it will need a new logic/motherboard.
Any experts here managed to sucessfully fix one of these?

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I too have periodically experienced a strange noise (spinning/hissing/scratching) coming from the area where the power adapter cord plugs in to my powerbook. The sound is louder than my HD activity.
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My computer's power adapter is plugged into a power source, yet the indicator light is not working and my computer is not being charged.

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