Satellite A300 not recognizing AC adapter when turned on

My Toshiba Satellite A300 is having the following problem:

* When the laptop is turned off, the computer recognizes the power adapter and charge the battery.
* When the laptop is turned on, the computer * NOT * RECOGNIZE the power adapter.
It uses the battery until exhausted.

I'm only able to charge the battery with the laptop is turned off. I've tried several power adapters and same symptoms persist.

What could this be?

You can use your laptop battery is removed and connected to the AC adapter only?

Tags: Toshiba

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